Wikipedia:Reference desk/Archives/Mathematics/February 2009

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February 1

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 1

1. Power Series Expansion
2. Number sequence help
3. Probability function
4. Zero divisors in polynomial rings
5. what is the most important mathematical operation
6. Ratio of binomial coefficients
7. This is Question of sequence & series
8. Seemingly straightforward problem

February 2

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 2

1. "Complement" of an automorphism group
2. mathematics
3. Name of a type of puzzle
4. Four fours
5. What is this type of problem called?
6. Expanding an integral
7. Capitalization conundrum
8. Golden ratio tesselation?
9. Function proof, hard one

February 3

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 3

1. Solving the diffusion equation
2. Anti-derivatives vs Riemann sums
3. Surds Question

February 4

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 4

1. Goldbach Conjecture insurance
2. ∫f(x) Integration without dx
3. Confidence interval
4. Units going bad
5. Constructing a series

February 5

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 5

1. Trig integral?
2. A difficult algebra problem involving logarithms
3. What's the best tool for signal intersection?
4. Open interval as a disjoint union of closed intervals
5. Log normal distribution
6. Countable series in the rationals

February 6

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 6

1. Series
2. Question on roots
3. Beat Frequency for Pulses
4. Integers.
5. Time in relation to Travel

February 7

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 7

1. Moore plane and Local compactness
2. I need the next in this sequence
3. Application of F-statistic and Mallows Cp
4. Graphical Transformations

February 8

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 8

1. Linear Forms of Quadratic Equations
2. Vector fields and surface normals
3. Interest Banks pay.

February 9

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 9

1. Solenoidal Fields, Curl and Div
2. Master Theorem
3. is there a proof that no "betting system" can affect the expected return
4. [[Wikipedia:Reference_desk/Archives/Mathematics/2009 February 9#Given that set A = {1,2,{3,4}}, is 3 a member of A?|Given that set A = {1,2,{3,4}}, is 3 a member of A?]]
5. Divisibility

February 10

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 10

1. Different sized infinitesimals
2. Is this some kind of joke?

February 11

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 11

1. Help me grok e
2. I don't understand this proof
3. Degree of Relatedness
4. Absolute Integrability
5. GENERAL QUESTION>

February 12

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 12

1. Matrix property
2. Points in [0,1] whose decimal expansions contain only the digits 4 and 7
3. Book recommendations
4. Simple Math

February 13

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 13

1. Finding x in logs
2. Finding distance given initial speed and friction
3. College Math Problem Plea ....

February 14

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 14

1. Mathematical fraction
2. Numbers
3. Dice game problem
4. is it possible to fuck up when combining two random number generators?

February 15

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 15

1. Formula for partial derivative of A with respect to B given that f(A,B) is constant, applied to vectors
2. The Problem I am stuck with
3. Collatz-like sequence
4. Name the curve
5. Maths: discovery or invention?
6. Not serious series

February 16

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 16

1. CASINOS
2. Didn't understand

February 17

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 17

1. Finding unknown constant in function
2. Simplifying an Equation
3. Principal Ideal Ring, not an Integral Domain
4. Maximal LFSRs
5. CHain rule question

February 18

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 18

1. Making n the subject
2. A rant about inequalities
3. Problem from Linear Algebra

February 19

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 19

1. Orthogonal
2. Surd Questions
3. Akin to absolute value
4. Help with LaTeX
5. Finite multiplicative subgroup of direct product of fields
6. Showing my working
7. Theory about graphs

February 20

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 20

1. Analysis on an interesting function
2. Setting up Maekawa's Algorithm
3. Unreachable chess positions
4. Stuck with a PDE (Schrödinger)
5. A polar closure property

February 21

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 21

1. Maximum number on calculator
2. Intelligent design and the value of pi
3. Quick vector calculus question
4. Permutation and Combination
5. Level Curve Interpolation

February 22

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 22

1. Even and Odd Functions and Their Decomposition
2. Graham's number in terms of the Ackermann function
3. Closed form of a recursive series
4. Fast fourier transform.
5. Long and Synthetic Division Symbols on Office Word

February 23

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 23

1. Simple (i think) vector integral inequality
2. Terminology
3. Using a converse of the FTC part II
4. What is the difference between double bar and a single bar

February 24

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 24

1. Limit of a maximum of functions
2. Special Unitary group over a finite field
3. The sum of all numbers between 0 and n (including n)
4. length across an ellipse derivation
5. Investment question
6. Types of functions

February 25

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 25

1. Is every PID Noetherian
2. Simultaneously pyramidal and square

February 26

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 26

1. Probability?
2. Algebra for a card game

February 27

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 27

1. stats question/puzzles.
2. Exponential/Log of a continuous linear operator
3. Calendar question.

February 28

Wikipedia:Reference_desk/Archives/Mathematics/2009 February 28

1. Decidability question
2. Free 3D graphing Program
3. Factorial with a big twist