Wikipedia:Reference desk/Archives/Mathematics/February 2012

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February 1

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 1

1. Determining probability quickly

February 2

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 2

1. good introduction to abstract algebra from very basics
2. Regular or partial (definite integral) notation (i.e., “d” or “∂”)?

February 3

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 3

1. Isosceles right triangle
2. Computing values for the Riemann zeta function
3. PARTIALLY resolved?

February 5

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 5

1. /3
2. Name of 0
3. Reduced residue systems

February 6

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 6

1. Max Quad Area
2. Category theory homework problem - subobject classifier and showing a morphism is self-inverse
3. Does an adjective exist to describe this situation?
4. t-test help please
5. Froda's Theorem Flawed ?
6. Maple advice
7. Sums of unit vectors of prime factions of pi?

February 7

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 7

1. Trains allegedly haul 1 ton for nearly 500 miles on a gallon. How to calculate?
2. Angle bisector problem

February 8

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 8

1. Problem solving : work backward
2. Time lag in second-order positive feedback
3. Value of infinite limit

February 9

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 9

1. Unique Factorization Domain
2. Offsetting an ellipse
3. Stationary functions of a functional

February 10

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 10

1. Minimum area of a quadrilateral
2. modulo arithmetic
3. Greatest Common Divisor of Two Polynomials
4. Solving the 3-body problem if two of the objects are stationary
5. Mercator latitude scaling

February 11

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 11

1. Using mod (i.e. remainder after division) on complex numbers

February 12

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 12

1. Preliminary tests for regression analysis in SPSS; ANCOVA in SPSS
2. Division by zero
3. 0/0=0^0?

February 13

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 13

1. Exact solution to the Hénon map

February 14

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 14

1. Number naming system
2. RANSAC number of iterations
3. Diophantine equations
4. Planar graphs and coloring

February 15

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 15

1. A Quick Proof
2. Central tendency and usefulness of measurements
3. Limit conditions
4. Non-Standard Proof
5. Spectral radius of a derivative

February 16

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 16

1. drawbacks to riemann & riemann stieltjes integral
2. Differential equations describing Euler's three-body problem

February 18

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 18

1. Topological relationship between a sphere and a cone?
2. Strange voting system
3. 3y-2x=5+9y-2x

February 19

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 19

1. Geometric algebra question: degrees of freedom to a k-blade
2. describe conditions that would allow you to martingale
3. f(1/x)

February 20

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 20

1. Trig functions

February 21

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 21

1. phi(n) question
2. Statistics and entailment

February 22

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 22

1. Radians and calculus
2. Matrix Eigenvalues
3. New method for long division
4. Quadratic Eigenvalue Problem with Circulant Matrices
5. Finding quadratic formula
6. Curl

February 23

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 23

1. Math Problem
2. Trig function help
3. Difference between a series and a progression
4. Uniqueness of injective/flat resolutions
5. Heart-shaped function
6. MATH GESSUING
7. Area enclosed

February 24

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 24

1. Solids of revolution by cylindrical shells
2. Length of the curve of any polynomial
3. Question: limits of partially defined functions on the reals
4. Products

February 25

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 25

1. Integrating with the natural logarithm

February 26

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 26

1. relating entropy ratchet to stock market fluctuations

February 27

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 27

1. Logarithms
2. How to reverse XORs
3. U.S. income tax revenue
4. Diophantine equations
5. Calculating the equation of a line tangent to a circle that passes through a particular point

February 28

Wikipedia:Reference_desk/Archives/Mathematics/2012 February 28

1. differentiation operator "d" and partial derivatives
2. Solutions to a transcendental equation
3. Solving a differential equation using the Green's function
4. Adding/subtracting sine waves of the same frequency