Wikipedia:Reference desk/Archives/Mathematics/February 2009

= February 1 = 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 = 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 = Reference_desk/Archives/Mathematics/2009 February 3


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

= February 4 = 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 = 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 = 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 = 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 = 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 = 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) Given that set A = {1,2,{3,4}}, is 3 a member of A?
 * 5) Divisibility

= February 10 = Reference_desk/Archives/Mathematics/2009 February 10


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

= February 11 = 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 = 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 = 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 = 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 = 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 = Reference_desk/Archives/Mathematics/2009 February 16


 * 1) CASINOS
 * 2) Didn't understand

= February 17 = 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 = Reference_desk/Archives/Mathematics/2009 February 18


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

= February 19 = 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 = 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 = 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 = 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 = 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 = 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 = Reference_desk/Archives/Mathematics/2009 February 25


 * 1) Is every PID Noetherian
 * 2) Simultaneously pyramidal and square

= February 26 = Reference_desk/Archives/Mathematics/2009 February 26


 * 1) Probability?
 * 2) Algebra for a card game

= February 27 = Reference_desk/Archives/Mathematics/2009 February 27


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

= February 28 = Reference_desk/Archives/Mathematics/2009 February 28


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