Wikipedia:Reference desk/Archives/Mathematics/August 2011

= August 1 = Reference_desk/Archives/Mathematics/2011 August 1


 * 1) Aleph and beth numbers
 * 2) An inequality

= August 2 = Reference_desk/Archives/Mathematics/2011 August 2


 * 1) Sum formula

= August 3 = Reference_desk/Archives/Mathematics/2011 August 3


 * 1) Statistical significance concept
 * 2) BZ2 question about entropy
 * 3) Epsilon
 * 4) a question of modal logic, validity and rules of inference

= August 4 = Reference_desk/Archives/Mathematics/2011 August 4


 * 1) Estimating flow in partially filled pipe

= August 5 = Reference_desk/Archives/Mathematics/2011 August 5


 * 1) A good calculator for Mac OS X
 * 2) 653xy divisible by 80
 * 3) A Simple PDE

= August 6 = Reference_desk/Archives/Mathematics/2011 August 6


 * 1) Parabolic  Problem
 * 2) Differentiability
 * 3) Imaginary Numbers

= August 7 = Reference_desk/Archives/Mathematics/2011 August 7


 * 1) How natural and universal is mathematics?

= August 8 = Reference_desk/Archives/Mathematics/2011 August 8


 * 1) I need a resource for studying the basics of convexity and relations
 * 2) Categorical description of a nonstandard model of first order Peano arithmetic?

= August 9 = Reference_desk/Archives/Mathematics/2011 August 9


 * 1) Uniform vs Pointwise Continuity
 * 2) Is the book's answer wrong?
 * 3) Dirverging  in  all Directions
 * 4) Some Basic Numerics Questions
 * 5) Limit as x approaches 0 cos(x)/x

= August 10 = Reference_desk/Archives/Mathematics/2011 August 10


 * 1) Question about Time and Complexity Class RE
 * 2) Is zero really an even number?
 * 3) Shape similarity?
 * 4) Statistics – p and α

= August 11 = Reference_desk/Archives/Mathematics/2011 August 11


 * 1) Length of a golf shot
 * 2) Directions in study
 * 3) physics
 * 4) math class

= August 12 = Reference_desk/Archives/Mathematics/2011 August 12


 * 1) Can this be solved / approximated tractably?
 * 2) musical notes

= August 13 = Reference_desk/Archives/Mathematics/2011 August 13


 * 1) Infinite Dimensional Spaces
 * 2) Metamath question
 * 3) what if everyone on facebook friended their friends' friends and they had to accept
 * 4) Is Yahoo answers correct?
 * 5) Monotone functions

= August 14 = Reference_desk/Archives/Mathematics/2011 August 14


 * 1) Imaginary Fibonacci

= August 15 = Reference_desk/Archives/Mathematics/2011 August 15


 * 1) "Most"
 * 2) factoring integers
 * 3) Is the probability of guessing the right number out of N choices one in N^2?
 * 4) Riemann?

= August 16 = Reference_desk/Archives/Mathematics/2011 August 16


 * 1) Extracting parameters from a matrix form ellipse

= August 17 = Reference_desk/Archives/Mathematics/2011 August 17


 * 1) Air Resistance Terminal Velocity
 * 2) DeeperQA's nearly the last theorem
 * 3) Real Number
 * 4) Self study mathematics
 * 5) Quadratic equation with a mod operator
 * 6) knapsack problem problem

= August 19 = Reference_desk/Archives/Mathematics/2011 August 19


 * 1) Binomial theorem and convergence

= August 20 = Reference_desk/Archives/Mathematics/2011 August 20


 * 1) Recursive sequence
 * 2) Subsets
 * 3) Statistical hypothesis testing of Poisson processes
 * 4) (1+x)^n ≥ 1+nx
 * 5) Ratio from percent
 * 6) derivative
 * 7) ? (what is infinity times zero?)

= August 21 = Reference_desk/Archives/Mathematics/2011 August 21


 * 1) Arithmetic mean of two numbers > Geometric mean of two numbers.
 * 2) Circle geometry
 * 3) Triangles
 * 4) range of a transformation on the set of polynomials
 * 5) Number Triangle
 * 6) math (pressing homework question)

= August 22 = Reference_desk/Archives/Mathematics/2011 August 22


 * 1) Simplify a sum involving binomial coefficients
 * 2) Trajectories, gravity, acceleration, straightforward calculus
 * 3) Getting a Formula Given Points: Step-Like Function
 * 4) Derivation of Poiseuille's Law

= August 23 = Reference_desk/Archives/Mathematics/2011 August 23


 * 1) Multiplying a Factorial by Another Factorial
 * 2) Factorization
 * 3) Why the long tail is just a 2 variables graph and not a 3 variables graph??

= August 24 = Reference_desk/Archives/Mathematics/2011 August 24


 * 1) Real cube roots of the identity matrix
 * 2) Problem from Spivak's Calculus

= August 25 = Reference_desk/Archives/Mathematics/2011 August 25


 * 1) Logarithmic Spiral
 * 2) Proof too easy?

= August 26 = Reference_desk/Archives/Mathematics/2011 August 26


 * 1) Limit to infinity
 * 2) FLAW in Cauchy's proof for the inequality of arithmetic and geometric means?!
 * 3) Cumulative position probabilities as a result of tossing dice
 * 4) I have a question about fractals.

= August 27 = Reference_desk/Archives/Mathematics/2011 August 27


 * 1) Show that the set of bounded functions is infinite dimensional
 * 2) Previous problem with generalized dice
 * 3) Can you solve this?
 * 4) Commas in non-decimal numbers

= August 28 = Reference_desk/Archives/Mathematics/2011 August 28


 * 1) Kernel of a transformation on the set of polynomials
 * 2) Partial Derivative of Volume of Cone
 * 3) Cone terminology
 * 4) Romanian math
 * 5) A question about $ zeta (0) $

= August 30 = Reference_desk/Archives/Mathematics/2011 August 30


 * 1) Expected sum of random variables

= August 31 = Reference_desk/Archives/Mathematics/2011 August 31


 * 1) When is xxxx0831 prime?
 * 2) Solving a problem with constraints
 * 3) Sum of n-sums
 * 4) is it correct
 * 5) Difference quotient