- k-ary Divisor ({{MathWorld | urlname=k-aryDivisor | title=k-ary Divisor}}): k-ary divisor
- k-Automatic Set ({{MathWorld | urlname=k-AutomaticSet | title=k-Automatic Set}}): k-Automatic set
- k-Balanced ({{MathWorld | urlname=k-Balanced | title=k-Balanced}}): k-Balanced
- k-Chain ({{MathWorld | urlname=k-Chain | title=k-Chain}}): k-Chain
- k-Chromatic Graph ({{MathWorld | urlname=k-ChromaticGraph | title=k-Chromatic Graph}}): k-Chromatic graph
- k-Circuit ({{MathWorld | urlname=k-Circuit | title=k-Circuit}}): k-Circuit
- k-Colorable Graph ({{MathWorld | urlname=k-ColorableGraph | title=k-Colorable Graph}}): k-Colorable graph
- k-Colored Graph ({{MathWorld | urlname=k-ColoredGraph | title=k-Colored Graph}}): k-Colored graph
- k-Coloring ({{MathWorld | urlname=k-Coloring | title=k-Coloring}}): k-Coloring
- k-Connected Graph ({{MathWorld | urlname=k-ConnectedGraph | title=k-Connected Graph}}): k-Connected graph
- k-Edge-Connected Graph ({{MathWorld | urlname=k-Edge-ConnectedGraph | title=k-Edge-Connected Graph}}): k-Edge-Connected graph
- k-Factor ({{MathWorld | urlname=k-Factor | title=k-Factor}}): k-Factor
- k-Factorable Graph ({{MathWorld | urlname=k-FactorableGraph | title=k-Factorable Graph}}): k-Factorable graph
- k-Form ({{MathWorld | urlname=k-Form | title=k-Form}}): k-Form
- K-Function ({{MathWorld | urlname=K-Function | title=K-Function}}): K-Function
- K-Graph ({{MathWorld | urlname=K-Graph | title=K-Graph}}): K-Graph
- K-Map ({{MathWorld | urlname=K-Map | title=K-Map}}): K-Map
- k-Matrix ({{MathWorld | urlname=k-Matrix | title=k-Matrix}}): k-Matrix
- K-Means Clustering Algorithm ({{MathWorld | urlname=K-MeansClusteringAlgorithm | title=K-Means Clustering Algorithm}}): K-Means clustering algorithm
- k-Partite Graph ({{MathWorld | urlname=k-PartiteGraph | title=k-Partite Graph}}): k-Partite graph
- k-Statistic ({{MathWorld | urlname=k-Statistic | title=k-Statistic}}): k-Statistic
- k-Subset ({{MathWorld | urlname=k-Subset | title=k-Subset}}): k-Subset
- K-Theory ({{MathWorld | urlname=K-Theory | title=K-Theory}}): K-Theory
- k-Tuple ({{MathWorld | urlname=k-Tuple | title=k-Tuple}}): k-Tuple
- k-Tuple Conjecture ({{MathWorld | urlname=k-TupleConjecture | title=k-Tuple Conjecture}}): k-Tuple conjecture
- Kac Formula ({{MathWorld | urlname=KacFormula | title=Kac Formula}}): Kac formula
- Kac Matrix ({{MathWorld | urlname=KacMatrix | title=Kac Matrix}}): Kac matrix
- Kadomtsev-Petviashvili-Burgers Equation ({{MathWorld | urlname=Kadomtsev-Petviashvili-BurgersEquation | title=Kadomtsev-Petviashvili-Burgers Equation}}): Kadomtsev-Petviashvili-Burgers equation
- Kadomtsev-Petviashvili Equation ({{MathWorld | urlname=Kadomtsev-PetviashviliEquation | title=Kadomtsev-Petviashvili Equation}}): Kadomtsev-Petviashvili equation
- Kähler Form ({{MathWorld | urlname=KaehlerForm | title=Kähler Form}}): Kähler form
- Kähler Identities ({{MathWorld | urlname=KaehlerIdentities | title=Kähler Identities}}): Kähler identities
- Kähler Manifold ({{MathWorld | urlname=KaehlerManifold | title=Kähler Manifold}}): Kähler manifold
- Kähler Metric ({{MathWorld | urlname=KaehlerMetric | title=Kähler Metric}}): Kähler metric
- Kähler Potential ({{MathWorld | urlname=KaehlerPotential | title=Kähler Potential}}): Kähler potential
- Kähler Structure ({{MathWorld | urlname=KaehlerStructure | title=Kähler Structure}}): Kähler structure
- Kakeya Needle Problem ({{MathWorld | urlname=KakeyaNeedleProblem | title=Kakeya Needle Problem}}): Kakeya needle problem
- Kakeya Set ({{MathWorld | urlname=KakeyaSet | title=Kakeya Set}}): Kakeya set
- Kakutani's Fixed Point Theorem ({{MathWorld | urlname=KakutanisFixedPointTheorem | title=Kakutani's Fixed Point Theorem}}): Kakutani's fixed point theorem
- Kakutani's Problem ({{MathWorld | urlname=KakutanisProblem | title=Kakutani's Problem}}): Kakutani's problem
- Kalman Filter ({{MathWorld | urlname=KalmanFilter | title=Kalman Filter}}): Kalman filter
- Kampé de Fériet Function ({{MathWorld | urlname=KampedeFerietFunction | title=Kampé de Fériet Function}}): Kampé de fériet function
- Kampyle of Eudoxus ({{MathWorld | urlname=KampyleofEudoxus | title=Kampyle of Eudoxus}}): Kampyle of eudoxus
- KAM Theorem ({{MathWorld | urlname=KAMTheorem | title=KAM Theorem}}): KAM theorem
- Kanizsa Triangle ({{MathWorld | urlname=KanizsaTriangle | title=Kanizsa Triangle}}): Kanizsa triangle
- Kantorovich Inequality ({{MathWorld | urlname=KantorovichInequality | title=Kantorovich Inequality}}): Kantorovich inequality
- Kaplan-Yorke Conjecture ({{MathWorld | urlname=Kaplan-YorkeConjecture | title=Kaplan-Yorke Conjecture}}): Kaplan-Yorke conjecture
- Kaplan-Yorke Dimension ({{MathWorld | urlname=Kaplan-YorkeDimension | title=Kaplan-Yorke Dimension}}): Kaplan-Yorke dimension
- Kaplan-Yorke Map ({{MathWorld | urlname=Kaplan-YorkeMap | title=Kaplan-Yorke Map}}): Kaplan-Yorke map
- Kappa Curve ({{MathWorld | urlname=KappaCurve | title=Kappa Curve}}): Kappa curve
- Kaprekar Constant ({{MathWorld | urlname=KaprekarConstant | title=Kaprekar Constant}}): Kaprekar constant
- Kaprekar Number ({{MathWorld | urlname=KaprekarNumber | title=Kaprekar Number}}): Kaprekar number
- Kaprekar Routine ({{MathWorld | urlname=KaprekarRoutine | title=Kaprekar Routine}}): Kaprekar routine
- Kaprekar Sequence ({{MathWorld | urlname=KaprekarSequence | title=Kaprekar Sequence}}): Kaprekar sequence
- Kaps-Rentrop Methods ({{MathWorld | urlname=Kaps-RentropMethods | title=Kaps-Rentrop Methods}}): Kaps-Rentrop methods
- Kapteyn Series ({{MathWorld | urlname=KapteynSeries | title=Kapteyn Series}}): Kapteyn series
- Karamata's Tauberian Theorem ({{MathWorld | urlname=KaramatasTauberianTheorem | title=Karamata's Tauberian Theorem}}): Karamata's tauberian theorem
- Karatsuba Multiplication ({{MathWorld | urlname=KaratsubaMultiplication | title=Karatsuba Multiplication}}): Karatsuba multiplication
- Karnaugh Map ({{MathWorld | urlname=KarnaughMap | title=Karnaugh Map}}): Karnaugh map
- Katadrome ({{MathWorld | urlname=Katadrome | title=Katadrome}}): Katadrome
- Katona's Problem ({{MathWorld | urlname=KatonasProblem | title=Katona's Problem}}): Katona's problem
- Kauffman Polynomial F ({{MathWorld | urlname=KauffmanPolynomialF | title=Kauffman Polynomial F}}): Kauffman polynomial f
- Kauffman Polynomial X ({{MathWorld | urlname=KauffmanPolynomialX | title=Kauffman Polynomial X}}): Kauffman polynomial x
- Kaup's Equation ({{MathWorld | urlname=KaupsEquation | title=Kaup's Equation}}): Kaup's equation
- Kawaguchi Geometry ({{MathWorld | urlname=KawaguchiGeometry | title=Kawaguchi Geometry}}): Kawaguchi geometry
- Kawasaki's Theorem ({{MathWorld | urlname=KawasakisTheorem | title=Kawasaki's Theorem}}): Kawasaki's theorem
- Kei ({{MathWorld | urlname=Kei | title=Kei}}): Kei
- Keith Number ({{MathWorld | urlname=KeithNumber | title=Keith Number}}): Keith number
- Keller's Conjecture ({{MathWorld | urlname=KellersConjecture | title=Keller's Conjecture}}): Keller's conjecture
- KelvinBei ({{MathWorld | urlname=KelvinBei | title=KelvinBei}}): KelvinBei
- KelvinBer ({{MathWorld | urlname=KelvinBer | title=KelvinBer}}): KelvinBer
- Kelvin Differential Equation ({{MathWorld | urlname=KelvinDifferentialEquation | title=Kelvin Differential Equation}}): Kelvin differential equation
- Kelvin Function of the First Kind ({{MathWorld | urlname=KelvinFunctionoftheFirstKind | title=Kelvin Function of the First Kind}}): Kelvin function of the first kind
- Kelvin Function of the Second Kind ({{MathWorld | urlname=KelvinFunctionoftheSecondKind | title=Kelvin Function of the Second Kind}}): Kelvin function of the second kind
- Kelvin Functions ({{MathWorld | urlname=KelvinFunctions | title=Kelvin Functions}}): Kelvin functions
- KelvinKei ({{MathWorld | urlname=KelvinKei | title=KelvinKei}}): KelvinKei
- KelvinKer ({{MathWorld | urlname=KelvinKer | title=KelvinKer}}): KelvinKer
- Kelvin Problem ({{MathWorld | urlname=KelvinProblem | title=Kelvin Problem}}): Kelvin problem
- Kelvin's Conjecture ({{MathWorld | urlname=KelvinsConjecture | title=Kelvin's Conjecture}}): Kelvin's conjecture
- Kelvin Transformation ({{MathWorld | urlname=KelvinTransformation | title=Kelvin Transformation}}): Kelvin transformation
- Kempe Chain ({{MathWorld | urlname=KempeChain | title=Kempe Chain}}): Kempe chain
- Kempe Linkage ({{MathWorld | urlname=KempeLinkage | title=Kempe Linkage}}): Kempe linkage
- Kempner Series ({{MathWorld | urlname=KempnerSeries | title=Kempner Series}}): Kempner series
- Kendall Operator ({{MathWorld | urlname=KendallOperator | title=Kendall Operator}}): Kendall operator
- Kenmotu Circle ({{MathWorld | urlname=KenmotuCircle | title=Kenmotu Circle}}): Kenmotu circle
- Kenmotu Point ({{MathWorld | urlname=KenmotuPoint | title=Kenmotu Point}}): Kenmotu point
- Kepler-Bouwkamp Constant ({{MathWorld | urlname=Kepler-BouwkampConstant | title=Kepler-Bouwkamp Constant}}): Kepler-Bouwkamp constant
- Kepler Conjecture ({{MathWorld | urlname=KeplerConjecture | title=Kepler Conjecture}}): Kepler conjecture
- Kepler-Poinsot Solid ({{MathWorld | urlname=Kepler-PoinsotSolid | title=Kepler-Poinsot Solid}}): Kepler-Poinsot solid
- Kepler Problem ({{MathWorld | urlname=KeplerProblem | title=Kepler Problem}}): Kepler problem
- Kepler's Equation ({{MathWorld | urlname=KeplersEquation | title=Kepler's Equation}}): Kepler's equation
- Kepler's Folium ({{MathWorld | urlname=KeplersFolium | title=Kepler's Folium}}): Kepler's folium
- Kepler's Monsters ({{MathWorld | urlname=KeplersMonsters | title=Kepler's Monsters}}): Kepler's monsters
- Kepler Solid ({{MathWorld | urlname=KeplerSolid | title=Kepler Solid}}): Kepler solid
- ker ({{MathWorld | urlname=ker | title=ker}}): ker
- Ker ({{MathWorld | urlname=Ker | title=Ker}}): Ker
- Keratoid Cusp ({{MathWorld | urlname=KeratoidCusp | title=Keratoid Cusp}}): Keratoid cusp
- Kerkhoffs' Principle ({{MathWorld | urlname=KerkhoffsPrinciple | title=Kerkhoffs' Principle}}): Kerkhoffs' principle
- Kermack-McKendrick Model ({{MathWorld | urlname=Kermack-McKendrickModel | title=Kermack-McKendrick Model}}): Kermack-McKendrick model
- Kernel ({{MathWorld | urlname=Kernel | title=Kernel}}): Kernel
- Kernel Polynomial ({{MathWorld | urlname=KernelPolynomial | title=Kernel Polynomial}}): Kernel polynomial
- Kervaire's Characterization Theorem ({{MathWorld | urlname=KervairesCharacterizationTheorem | title=Kervaire's Characterization Theorem}}): Kervaire's characterization theorem
- Ket ({{MathWorld | urlname=Ket | title=Ket}}): Ket
- Khinchin ({{MathWorld | urlname=Khinchin | title=Khinchin}}): Khinchin
- Khinchin Constant ({{MathWorld | urlname=KhinchinConstant | title=Khinchin Constant}}): Khinchin constant
- Khinchin Harmonic Mean ({{MathWorld | urlname=KhinchinHarmonicMean | title=Khinchin Harmonic Mean}}): Khinchin harmonic mean
- Khinchin-Lévy Constant ({{MathWorld | urlname=Khinchin-LevyConstant | title=Khinchin-Lévy Constant}}): Khinchin-Lévy constant
- Khinchin's Constant ({{MathWorld | urlname=KhinchinsConstant | title=Khinchin's Constant}}): Khinchin's constant
- Khinchin's Constant Approximations ({{MathWorld | urlname=KhinchinsConstantApproximations | title=Khinchin's Constant Approximations}}): Khinchin's constant approximations
- Khintchine Constant ({{MathWorld | urlname=KhintchineConstant | title=Khintchine Constant}}): Khintchine constant
- Khintchine Harmonic Mean ({{MathWorld | urlname=KhintchineHarmonicMean | title=Khintchine Harmonic Mean}}): Khintchine harmonic mean
- Khovanski's Theorem ({{MathWorld | urlname=KhovanskisTheorem | title=Khovanski's Theorem}}): Khovanski's theorem
- Kibibyte ({{MathWorld | urlname=Kibibyte | title=Kibibyte}}): Kibibyte
- Kiepert Antipode ({{MathWorld | urlname=KiepertAntipode | title=Kiepert Antipode}}): Kiepert antipode
- Kiepert Center ({{MathWorld | urlname=KiepertCenter | title=Kiepert Center}}): Kiepert center
- Kiepert Conics ({{MathWorld | urlname=KiepertConics | title=Kiepert Conics}}): Kiepert conics
- Kiepert Hyperbola ({{MathWorld | urlname=KiepertHyperbola | title=Kiepert Hyperbola}}): Kiepert hyperbola
- Kiepert Parabola ({{MathWorld | urlname=KiepertParabola | title=Kiepert Parabola}}): Kiepert parabola
- Kieroid ({{MathWorld | urlname=Kieroid | title=Kieroid}}): Kieroid
- Killing Form ({{MathWorld | urlname=KillingForm | title=Killing Form}}): Killing form
- Killing's Equation ({{MathWorld | urlname=KillingsEquation | title=Killing's Equation}}): Killing's equation
- Killing Vectors ({{MathWorld | urlname=KillingVectors | title=Killing Vectors}}): Killing vectors
- Kilobyte ({{MathWorld | urlname=Kilobyte | title=Kilobyte}}): Kilobyte
- Kilroy Curve ({{MathWorld | urlname=KilroyCurve | title=Kilroy Curve}}): Kilroy curve
- Kimberling Center ({{MathWorld | urlname=KimberlingCenter | title=Kimberling Center}}): Kimberling center
- Kimberling Sequence ({{MathWorld | urlname=KimberlingSequence | title=Kimberling Sequence}}): Kimberling sequence
- Kimberling Shuffle ({{MathWorld | urlname=KimberlingShuffle | title=Kimberling Shuffle}}): Kimberling shuffle
- Kings Problem ({{MathWorld | urlname=KingsProblem | title=Kings Problem}}): Kings problem
- King's Tour Graph ({{MathWorld | urlname=KingsTourGraph | title=King's Tour Graph}}): King's tour graph
- King Walk ({{MathWorld | urlname=KingWalk | title=King Walk}}): King walk
- Kinney's Set ({{MathWorld | urlname=KinneysSet | title=Kinney's Set}}): Kinney's set
- Kinoshita-Terasaka Knot ({{MathWorld | urlname=Kinoshita-TerasakaKnot | title=Kinoshita-Terasaka Knot}}): Kinoshita-Terasaka knot
- Kinoshita-Terasaka Mutants ({{MathWorld | urlname=Kinoshita-TerasakaMutants | title=Kinoshita-Terasaka Mutants}}): Kinoshita-Terasaka mutants
- Kirby Calculus ({{MathWorld | urlname=KirbyCalculus | title=Kirby Calculus}}): Kirby calculus
- Kirby-Siebenmann Invariant ({{MathWorld | urlname=Kirby-SiebenmannInvariant | title=Kirby-Siebenmann Invariant}}): Kirby-Siebenmann invariant
- Kirby's List ({{MathWorld | urlname=KirbysList | title=Kirby's List}}): Kirby's list
- Kirchhoff Index ({{MathWorld | urlname=KirchhoffIndex | title=Kirchhoff Index}}): Kirchhoff index
- Kirchhoff's Matrix-Tree Theorem ({{MathWorld | urlname=KirchhoffsMatrix-TreeTheorem | title=Kirchhoff's Matrix-Tree Theorem}}): Kirchhoff's matrix-tree theorem
- Kirchhoff Sum Index ({{MathWorld | urlname=KirchhoffSumIndex | title=Kirchhoff Sum Index}}): Kirchhoff sum index
- Kirkman Points ({{MathWorld | urlname=KirkmanPoints | title=Kirkman Points}}): Kirkman points
- Kirkman's Schoolgirl Problem ({{MathWorld | urlname=KirkmansSchoolgirlProblem | title=Kirkman's Schoolgirl Problem}}): Kirkman's schoolgirl problem
- Kirkman Triple System ({{MathWorld | urlname=KirkmanTripleSystem | title=Kirkman Triple System}}): Kirkman triple system
- Kissing Circles Problem ({{MathWorld | urlname=KissingCirclesProblem | title=Kissing Circles Problem}}): Kissing circles problem
- Kissing Number ({{MathWorld | urlname=KissingNumber | title=Kissing Number}}): Kissing number
- Kiss Surface ({{MathWorld | urlname=KissSurface | title=Kiss Surface}}): Kiss surface
- Kite ({{MathWorld | urlname=Kite | title=Kite}}): Kite
- Kite Graph ({{MathWorld | urlname=KiteGraph | title=Kite Graph}}): Kite graph
- Kittell Graph ({{MathWorld | urlname=KittellGraph | title=Kittell Graph}}): Kittell graph
- Klarner-Rado Sequence ({{MathWorld | urlname=Klarner-RadoSequence | title=Klarner-Rado Sequence}}): Klarner-Rado sequence
- Klarner's Theorem ({{MathWorld | urlname=KlarnersTheorem | title=Klarner's Theorem}}): Klarner's theorem
- Kleene's Recursion Theorem ({{MathWorld | urlname=KleenesRecursionTheorem | title=Kleene's Recursion Theorem}}): Kleene's recursion theorem
- Kleene's s-m-n Theorem ({{MathWorld | urlname=Kleeness-m-nTheorem | title=Kleene's s-m-n Theorem}}): Kleene's s-m-n theorem
- Klee's Identity ({{MathWorld | urlname=KleesIdentity | title=Klee's Identity}}): Klee's identity
- Klein-Beltrami Model ({{MathWorld | urlname=Klein-BeltramiModel | title=Klein-Beltrami Model}}): Klein-Beltrami model
- Klein Bottle ({{MathWorld | urlname=KleinBottle | title=Klein Bottle}}): Klein bottle
- Klein Bottle Dissection ({{MathWorld | urlname=KleinBottleDissection | title=Klein Bottle Dissection}}): Klein bottle dissection
- Klein Curve ({{MathWorld | urlname=KleinCurve | title=Klein Curve}}): Klein curve
- Klein-Erdős-Szekeres Problem ({{MathWorld | urlname=Klein-Erdos-SzekeresProblem | title=Klein-Erdős-Szekeres Problem}}): Klein-Erdős-Szekeres problem
- Klein Four-Group ({{MathWorld | urlname=KleinFour-Group | title=Klein Four-Group}}): Klein four-group
- Klein-Gordon Equation ({{MathWorld | urlname=Klein-GordonEquation | title=Klein-Gordon Equation}}): Klein-Gordon equation
- Klein-Gordon-Maxwell Equation ({{MathWorld | urlname=Klein-Gordon-MaxwellEquation | title=Klein-Gordon-Maxwell Equation}}): Klein-Gordon-Maxwell equation
- Klein Graph ({{MathWorld | urlname=KleinGraph | title=Klein Graph}}): Klein graph
- Kleinian Group ({{MathWorld | urlname=KleinianGroup | title=Kleinian Group}}): Kleinian group
- Klein Invariant J ({{MathWorld | urlname=KleinInvariantJ | title=Klein Invariant J}}): Klein invariant j
- Klein Quartic ({{MathWorld | urlname=KleinQuartic | title=Klein Quartic}}): Klein quartic
- Klein's Absolute Invariant ({{MathWorld | urlname=KleinsAbsoluteInvariant | title=Klein's Absolute Invariant}}): Klein's absolute invariant
- Klein's Equation ({{MathWorld | urlname=KleinsEquation | title=Klein's Equation}}): Klein's equation
- Klein's Modular Function ({{MathWorld | urlname=KleinsModularFunction | title=Klein's Modular Function}}): Klein's modular function
- Klein's Theorem ({{MathWorld | urlname=KleinsTheorem | title=Klein's Theorem}}): Klein's theorem
- Kloosterman's Sum ({{MathWorld | urlname=KloostermansSum | title=Kloosterman's Sum}}): Kloosterman's sum
- Knapsack Problem ({{MathWorld | urlname=KnapsackProblem | title=Knapsack Problem}}): Knapsack problem
- Knar's Formula ({{MathWorld | urlname=KnarsFormula | title=Knar's Formula}}): Knar's formula
- Kneser Graph ({{MathWorld | urlname=KneserGraph | title=Kneser Graph}}): Kneser graph
- Kneser's Conjecture ({{MathWorld | urlname=KnesersConjecture | title=Kneser's Conjecture}}): Kneser's conjecture
- Kneser-Sommerfeld Formula ({{MathWorld | urlname=Kneser-SommerfeldFormula | title=Kneser-Sommerfeld Formula}}): Kneser-Sommerfeld formula
- Knights of the Round Table ({{MathWorld | urlname=KnightsoftheRoundTable | title=Knights of the Round Table}}): Knights of the round table
- Knight's Path ({{MathWorld | urlname=KnightsPath | title=Knight's Path}}): Knight's path
- Knights Problem ({{MathWorld | urlname=KnightsProblem | title=Knights Problem}}): Knights problem
- Knight's Tour ({{MathWorld | urlname=KnightsTour | title=Knight's Tour}}): Knight's tour
- Knight's Tour Graph ({{MathWorld | urlname=KnightsTourGraph | title=Knight's Tour Graph}}): Knight's tour graph
- Knödel Numbers ({{MathWorld | urlname=KnoedelNumbers | title=Knödel Numbers}}): Knödel numbers
- Knot ({{MathWorld | urlname=Knot | title=Knot}}): Knot
- Knot Cobordism ({{MathWorld | urlname=KnotCobordism | title=Knot Cobordism}}): Knot cobordism
- Knot Complement ({{MathWorld | urlname=KnotComplement | title=Knot Complement}}): Knot complement
- Knot Composition ({{MathWorld | urlname=KnotComposition | title=Knot Composition}}): Knot composition
- Knot Curve ({{MathWorld | urlname=KnotCurve | title=Knot Curve}}): Knot curve
- KnotData ({{MathWorld | urlname=KnotData | title=KnotData}}): KnotData
- Knot Determinant ({{MathWorld | urlname=KnotDeterminant | title=Knot Determinant}}): Knot determinant
- Knot Diagram ({{MathWorld | urlname=KnotDiagram | title=Knot Diagram}}): Knot diagram
- Knot Exterior ({{MathWorld | urlname=KnotExterior | title=Knot Exterior}}): Knot exterior
- Knot Genus ({{MathWorld | urlname=KnotGenus | title=Knot Genus}}): Knot genus
- Knot Group ({{MathWorld | urlname=KnotGroup | title=Knot Group}}): Knot group
- Knot Invariant ({{MathWorld | urlname=KnotInvariant | title=Knot Invariant}}): Knot invariant
- Knot Linking ({{MathWorld | urlname=KnotLinking | title=Knot Linking}}): Knot linking
- Knot Move ({{MathWorld | urlname=KnotMove | title=Knot Move}}): Knot move
- Knot Polynomial ({{MathWorld | urlname=KnotPolynomial | title=Knot Polynomial}}): Knot polynomial
- Knot Problem ({{MathWorld | urlname=KnotProblem | title=Knot Problem}}): Knot problem
- Knot Shadow ({{MathWorld | urlname=KnotShadow | title=Knot Shadow}}): Knot shadow
- Knot Signature ({{MathWorld | urlname=KnotSignature | title=Knot Signature}}): Knot signature
- Knot Sum ({{MathWorld | urlname=KnotSum | title=Knot Sum}}): Knot sum
- Knot Symmetry ({{MathWorld | urlname=KnotSymmetry | title=Knot Symmetry}}): Knot symmetry
- Knot Theory ({{MathWorld | urlname=KnotTheory | title=Knot Theory}}): Knot theory
- Knot Vector ({{MathWorld | urlname=KnotVector | title=Knot Vector}}): Knot vector
- Knuth-Bendix Algorithm ({{MathWorld | urlname=Knuth-BendixAlgorithm | title=Knuth-Bendix Algorithm}}): Knuth-Bendix algorithm
- Knuth-Bendix Completion Algorithm ({{MathWorld | urlname=Knuth-BendixCompletionAlgorithm | title=Knuth-Bendix Completion Algorithm}}): Knuth-Bendix completion algorithm
- Knuth-Bendix Procedure ({{MathWorld | urlname=Knuth-BendixProcedure | title=Knuth-Bendix Procedure}}): Knuth-Bendix procedure
- Knuth Number ({{MathWorld | urlname=KnuthNumber | title=Knuth Number}}): Knuth number
- Knuth's Series ({{MathWorld | urlname=KnuthsSeries | title=Knuth's Series}}): Knuth's series
- Kobon Triangle ({{MathWorld | urlname=KobonTriangle | title=Kobon Triangle}}): Kobon triangle
- Kochanski's Approximation ({{MathWorld | urlname=KochanskisApproximation | title=Kochanski's Approximation}}): Kochanski's approximation
- Kochansky's Approximation ({{MathWorld | urlname=KochanskysApproximation | title=Kochansky's Approximation}}): Kochansky's approximation
- Koch Antisnowflake ({{MathWorld | urlname=KochAntisnowflake | title=Koch Antisnowflake}}): Koch antisnowflake
- Koch Curve ({{MathWorld | urlname=KochCurve | title=Koch Curve}}): Koch curve
- Koch Island ({{MathWorld | urlname=KochIsland | title=Koch island}}): Koch island
- Koch Snowflake ({{MathWorld | urlname=KochSnowflake | title=Koch Snowflake}}): Koch snowflake
- Kodaira Embedding Theorem ({{MathWorld | urlname=KodairaEmbeddingTheorem | title=Kodaira Embedding Theorem}}): Kodaira embedding theorem
- Köbe Function ({{MathWorld | urlname=KoebeFunction | title=Köbe Function}}): Köbe function
- Köbe's One-Fourth Theorem ({{MathWorld | urlname=KoebesOne-FourthTheorem | title=Köbe's One-Fourth Theorem}}): Köbe's one-fourth theorem
- König-Egeváry Theorem ({{MathWorld | urlname=Koenig-EgevaryTheorem | title=König-Egeváry Theorem}}): König-Egeváry theorem
- Königsberg Bridge Problem ({{MathWorld | urlname=KoenigsbergBridgeProblem | title=Königsberg Bridge Problem}}): Königsberg bridge problem
- König's Lemma ({{MathWorld | urlname=KoenigsLemma | title=König's Lemma}}): König's lemma
- Koenigs-Poincaré Theorem ({{MathWorld | urlname=Koenigs-PoincareTheorem | title=Koenigs-Poincaré Theorem}}): Koenigs-Poincaré theorem
- König's Theorem ({{MathWorld | urlname=KoenigsTheorem | title=König's Theorem}}): König's theorem
- Kolakoski Constant ({{MathWorld | urlname=KolakoskiConstant | title=Kolakoski Constant}}): Kolakoski constant
- Kolakoski Sequence ({{MathWorld | urlname=KolakoskiSequence | title=Kolakoski Sequence}}): Kolakoski sequence
- Kollros' Theorem ({{MathWorld | urlname=KollrosTheorem | title=Kollros' Theorem}}): Kollros' theorem
- Kolmogorov-Arnold-Moser Theorem ({{MathWorld | urlname=Kolmogorov-Arnold-MoserTheorem | title=Kolmogorov-Arnold-Moser Theorem}}): Kolmogorov-Arnold-Moser theorem
- Kolmogorov Complexity ({{MathWorld | urlname=KolmogorovComplexity | title=Kolmogorov Complexity}}): Kolmogorov complexity
- Kolmogorov Consistency Principle ({{MathWorld | urlname=KolmogorovConsistencyPrinciple | title=Kolmogorov Consistency Principle}}): Kolmogorov consistency principle
- Kolmogorov Constant ({{MathWorld | urlname=KolmogorovConstant | title=Kolmogorov Constant}}): Kolmogorov constant
- Kolmogorov Criterion ({{MathWorld | urlname=KolmogorovCriterion | title=Kolmogorov Criterion}}): Kolmogorov criterion
- Kolmogorov Entropy ({{MathWorld | urlname=KolmogorovEntropy | title=Kolmogorov Entropy}}): Kolmogorov entropy
- Kolmogorov's Axioms ({{MathWorld | urlname=KolmogorovsAxioms | title=Kolmogorov's Axioms}}): Kolmogorov's axioms
- Kolmogorov-Sinai Entropy ({{MathWorld | urlname=Kolmogorov-SinaiEntropy | title=Kolmogorov-Sinai Entropy}}): Kolmogorov-Sinai entropy
- Kolmogorov-Smirnov Test ({{MathWorld | urlname=Kolmogorov-SmirnovTest | title=Kolmogorov-Smirnov Test}}): Kolmogorov-Smirnov test
- Kolmogorov Space ({{MathWorld | urlname=KolmogorovSpace | title=Kolmogorov Space}}): Kolmogorov space
- Komornik-Loreti Constant ({{MathWorld | urlname=Komornik-LoretiConstant | title=Komornik-Loreti Constant}}): Komornik-Loreti constant
- Kontorovich-Lebedev Transform ({{MathWorld | urlname=Kontorovich-LebedevTransform | title=Kontorovich-Lebedev Transform}}): Kontorovich-Lebedev transform
- Kontsevich Integral ({{MathWorld | urlname=KontsevichIntegral | title=Kontsevich Integral}}): Kontsevich integral
- Korselt's Criterion ({{MathWorld | urlname=KorseltsCriterion | title=Korselt's Criterion}}): Korselt's criterion
- Korteweg-de Vries-Burgers Equation ({{MathWorld | urlname=Korteweg-deVries-BurgersEquation | title=Korteweg-de Vries-Burgers Equation}}): Korteweg-de vries-burgers equation
- Korteweg-de Vries Equation ({{MathWorld | urlname=Korteweg-deVriesEquation | title=Korteweg-de Vries Equation}}): Korteweg-de vries equation
- Kosnita Point ({{MathWorld | urlname=KosnitaPoint | title=Kosnita Point}}): Kosnita point
- Kosnita Theorem ({{MathWorld | urlname=KosnitaTheorem | title=Kosnita Theorem}}): Kosnita theorem
- Kovalevskaya Exponent ({{MathWorld | urlname=KovalevskayaExponent | title=Kovalevskaya Exponent}}): Kovalevskaya exponent
- Kovalevskaya Top Equations ({{MathWorld | urlname=KovalevskayaTopEquations | title=Kovalevskaya Top Equations}}): Kovalevskaya top equations
- Kozyrev-Grinberg Theory ({{MathWorld | urlname=Kozyrev-GrinbergTheory | title=Kozyrev-Grinberg Theory}}): Kozyrev-Grinberg theory
- Krackhardt Kite ({{MathWorld | urlname=KrackhardtKite | title=Krackhardt Kite}}): Krackhardt kite
- Kramers Equation ({{MathWorld | urlname=KramersEquation | title=Kramers Equation}}): Kramers equation
- Kramers Rate ({{MathWorld | urlname=KramersRate | title=Kramers Rate}}): Kramers rate
- Kramp's Symbol ({{MathWorld | urlname=KrampsSymbol | title=Kramp's Symbol}}): Kramp's symbol
- Krasner's Lemma ({{MathWorld | urlname=KrasnersLemma | title=Krasner's Lemma}}): Krasner's lemma
- Krattenthaler Matrix Inversion Formula ({{MathWorld | urlname=KrattenthalerMatrixInversionFormula | title=Krattenthaler Matrix Inversion Formula}}): Krattenthaler matrix inversion formula
- Krawtchouk Polynomial ({{MathWorld | urlname=KrawtchoukPolynomial | title=Krawtchouk Polynomial}}): Krawtchouk polynomial
- Kreisel Conjecture ({{MathWorld | urlname=KreiselConjecture | title=Kreisel Conjecture}}): Kreisel conjecture
- Krichever-Novikov Equation ({{MathWorld | urlname=Krichever-NovikovEquation | title=Krichever-Novikov Equation}}): Krichever-Novikov equation
- Krohn-Rhodes Complexity ({{MathWorld | urlname=Krohn-RhodesComplexity | title=Krohn-Rhodes Complexity}}): Krohn-Rhodes complexity
- Krohn-Rhodes Theorem ({{MathWorld | urlname=Krohn-RhodesTheorem | title=Krohn-Rhodes Theorem}}): Krohn-Rhodes theorem
- Krohn-Rhodes Theory ({{MathWorld | urlname=Krohn-RhodesTheory | title=Krohn-Rhodes Theory}}): Krohn-Rhodes theory
- Kronecker Basis Theorem ({{MathWorld | urlname=KroneckerBasisTheorem | title=Kronecker Basis Theorem}}): Kronecker basis theorem
- Kronecker Cover ({{MathWorld | urlname=KroneckerCover | title=Kronecker Cover}}): Kronecker cover
- Kronecker Decomposition Theorem ({{MathWorld | urlname=KroneckerDecompositionTheorem | title=Kronecker Decomposition Theorem}}): Kronecker decomposition theorem
- Kronecker Delta ({{MathWorld | urlname=KroneckerDelta | title=Kronecker Delta}}): Kronecker delta
- Kronecker Product ({{MathWorld | urlname=KroneckerProduct | title=Kronecker Product}}): Kronecker product
- Kronecker's Algorithm ({{MathWorld | urlname=KroneckersAlgorithm | title=Kronecker's Algorithm}}): Kronecker's algorithm
- Kronecker's Approximation Theorem ({{MathWorld | urlname=KroneckersApproximationTheorem | title=Kronecker's Approximation Theorem}}): Kronecker's approximation theorem
- Kronecker's Constant ({{MathWorld | urlname=KroneckersConstant | title=Kronecker's Constant}}): Kronecker's constant
- Kronecker's Polynomial Theorem ({{MathWorld | urlname=KroneckersPolynomialTheorem | title=Kronecker's Polynomial Theorem}}): Kronecker's polynomial theorem
- Kronecker Sum ({{MathWorld | urlname=KroneckerSum | title=Kronecker Sum}}): Kronecker sum
- Kronecker Symbol ({{MathWorld | urlname=KroneckerSymbol | title=Kronecker Symbol}}): Kronecker symbol
- Kronecker-Weyl Theorem ({{MathWorld | urlname=Kronecker-WeylTheorem | title=Kronecker-Weyl Theorem}}): Kronecker-Weyl theorem
- Krull Dimension ({{MathWorld | urlname=KrullDimension | title=Krull Dimension}}): Krull dimension
- Krull's Principal Ideal Theorem ({{MathWorld | urlname=KrullsPrincipalIdealTheorem | title=Krull's Principal Ideal Theorem}}): Krull's principal ideal theorem
- Kruskal's Algorithm ({{MathWorld | urlname=KruskalsAlgorithm | title=Kruskal's Algorithm}}): Kruskal's algorithm
- Kruskal's Theorems ({{MathWorld | urlname=KruskalsTheorems | title=Kruskal's Theorems}}): Kruskal's theorems
- Kruskal's Tree Theorem ({{MathWorld | urlname=KruskalsTreeTheorem | title=Kruskal's Tree Theorem}}): Kruskal's tree theorem
- Kruskal-Wallis Test ({{MathWorld | urlname=Kruskal-WallisTest | title=Kruskal-Wallis Test}}): Kruskal-Wallis test
- KS Entropy ({{MathWorld | urlname=KSEntropy | title=KS Entropy}}): KS entropy
- Kuen Surface ({{MathWorld | urlname=KuenSurface | title=Kuen Surface}}): Kuen surface
- Kuhn-Tucker Theorem ({{MathWorld | urlname=Kuhn-TuckerTheorem | title=Kuhn-Tucker Theorem}}): Kuhn-Tucker theorem
- Kuiper Statistic ({{MathWorld | urlname=KuiperStatistic | title=Kuiper Statistic}}): Kuiper statistic
- Kulikowski's Theorem ({{MathWorld | urlname=KulikowskisTheorem | title=Kulikowski's Theorem}}): Kulikowski's theorem
- Kullback-Leibler Distance ({{MathWorld | urlname=Kullback-LeiblerDistance | title=Kullback-Leibler Distance}}): Kullback-Leibler distance
- Kummer Extension ({{MathWorld | urlname=KummerExtension | title=Kummer Extension}}): Kummer extension
- Kummer Graph ({{MathWorld | urlname=KummerGraph | title=Kummer Graph}}): Kummer graph
- Kummer Group ({{MathWorld | urlname=KummerGroup | title=Kummer Group}}): Kummer group
- Kummer's Conjecture ({{MathWorld | urlname=KummersConjecture | title=Kummer's Conjecture}}): Kummer's conjecture
- Kummer's Differential Equation ({{MathWorld | urlname=KummersDifferentialEquation | title=Kummer's Differential Equation}}): Kummer's differential equation
- Kummer's Formulas ({{MathWorld | urlname=KummersFormulas | title=Kummer's Formulas}}): Kummer's formulas
- Kummer's Function ({{MathWorld | urlname=KummersFunction | title=Kummer's Function}}): Kummer's function
- Kummer's Function of the Second Kind ({{MathWorld | urlname=KummersFunctionoftheSecondKind | title=Kummer's Function of the Second Kind}}): Kummer's function of the second kind
- Kummer's Quadratic Transformation ({{MathWorld | urlname=KummersQuadraticTransformation | title=Kummer's Quadratic Transformation}}): Kummer's quadratic transformation
- Kummer's Relation ({{MathWorld | urlname=KummersRelation | title=Kummer's Relation}}): Kummer's relation
- Kummer's Series ({{MathWorld | urlname=KummersSeries | title=Kummer's Series}}): Kummer's series
- Kummer's Series Transformation ({{MathWorld | urlname=KummersSeriesTransformation | title=Kummer's Series Transformation}}): Kummer's series transformation
- Kummer's Test ({{MathWorld | urlname=KummersTest | title=Kummer's Test}}): Kummer's test
- Kummer's Theorem ({{MathWorld | urlname=KummersTheorem | title=Kummer's Theorem}}): Kummer's theorem
- Kummer Surface ({{MathWorld | urlname=KummerSurface | title=Kummer Surface}}): Kummer surface
- Kupershmidt Equation ({{MathWorld | urlname=KupershmidtEquation | title=Kupershmidt Equation}}): Kupershmidt equation
- Kuramoto-Sivashinsky Equation ({{MathWorld | urlname=Kuramoto-SivashinskyEquation | title=Kuramoto-Sivashinsky Equation}}): Kuramoto-Sivashinsky equation
- Kuratowski Graph ({{MathWorld | urlname=KuratowskiGraph | title=Kuratowski Graph}}): Kuratowski graph
- Kuratowski Reduction Theorem ({{MathWorld | urlname=KuratowskiReductionTheorem | title=Kuratowski Reduction Theorem}}): Kuratowski reduction theorem
- Kuratowski's Closure-Complement Problem ({{MathWorld | urlname=KuratowskisClosure-ComplementProblem | title=Kuratowski's Closure-Complement Problem}}): Kuratowski's closure-complement problem
- Kuratowski's Theorem ({{MathWorld | urlname=KuratowskisTheorem | title=Kuratowski's Theorem}}): Kuratowski's theorem
- Kűrschák's Theorem ({{MathWorld | urlname=KurschaksTheorem | title=Kűrschák's Theorem}}): Kűrschák's theorem
- Kűrschák's Tile ({{MathWorld | urlname=KurschaksTile | title=Kűrschák's Tile}}): Kűrschák's tile
- Kurtosis ({{MathWorld | urlname=Kurtosis | title=Kurtosis}}): Kurtosis
- Kurtosis Excess ({{MathWorld | urlname=KurtosisExcess | title=Kurtosis Excess}}): Kurtosis excess
- KV-Map ({{MathWorld | urlname=KV-Map | title=KV-Map}}): KV-Map
- Kynea Number ({{MathWorld | urlname=KyneaNumber | title=Kynea Number}}): Kynea number