Wikipedia:Reference desk/Archives/Mathematics/June 2009

= June 1 = Reference_desk/Archives/Mathematics/2009 June 1


 * 1) Could set theory (ZFC) be wrong?
 * 2) Euler's identity

= June 2 = Reference_desk/Archives/Mathematics/2009 June 2


 * 1) Integration
 * 2) babyloian quadratic equations
 * 3) Conic section ellipse
 * 4) Looking for a textbook on solid geometry
 * 5) Functional Analysis
 * 6) What inequality should I use here

= June 3 = Reference_desk/Archives/Mathematics/2009 June 3


 * 1) How Many Triangles?
 * 2) Modelling "value" for used cars
 * 3) u dv

= June 4 = Reference_desk/Archives/Mathematics/2009 June 4


 * 1) Cirumference of a circle

= June 5 = Reference_desk/Archives/Mathematics/2009 June 5


 * 1) Topology: Density of rational functions and Euclidean Balls
 * 2) volume of torus

= June 6 = Reference_desk/Archives/Mathematics/2009 June 6


 * 1) Separated/connected equivalence
 * 2) Spherical wedge

= June 7 = Reference_desk/Archives/Mathematics/2009 June 7


 * 1) Hypothesis testing, backwards?
 * 2) Connected sets
 * 3) A particular quotient space.
 * 4) Could it turn out that no axiomatic system is consistent?
 * 5) Pairwise intersecting sets of bounded size

= June 8 = Reference_desk/Archives/Mathematics/2009 June 8


 * 1) statistics
 * 2) Why doesn't 10 divided by zero equal infinity?
 * 3) Plotting contour lines from discrete points

= June 9 = Reference_desk/Archives/Mathematics/2009 June 9


 * 1) Can a limit be infinite?
 * 2) Wedge again
 * 3) Look-and-say sequence
 * 4) Harmonic function
 * 5) Set of coordinates in R^2 with exactly 1 rational point - connected?

= June 10 = Reference_desk/Archives/Mathematics/2009 June 10


 * 1) Solution to a nonlinear ODE
 * 2) Topology question

= June 11 = Reference_desk/Archives/Mathematics/2009 June 11


 * 1) Pooling related binomial statistics
 * 2) Graphing complex functions online
 * 3) Proof that the axiom of choice implies the well-ordering principle?

= June 12 = Reference_desk/Archives/Mathematics/2009 June 12


 * 1) A question of sociopathic probability...
 * 2) crazy hard math question
 * 3) Differentiating the Jacobian determinant, need some help!

= June 13 = Reference_desk/Archives/Mathematics/2009 June 13


 * 1) Paradox of the twots
 * 2) Twin prime version of Copeland-Erdos constant
 * 3) Need help with radical equation questions.

= June 14 = Reference_desk/Archives/Mathematics/2009 June 14


 * 1) alzebra quary of 9 standard

= June 15 = Reference_desk/Archives/Mathematics/2009 June 15


 * 1) Predicting Score in a T20 match
 * 2) Olympiad question
 * 3) Conic section-Simultaneity in relativity
 * 4) I divide every value in a table with the smallest value in the same table. What have I done.
 * 5) Differential equation
 * 6) Formula for Sine based on just angle
 * 7) Growth rate of functions

= June 16 = Reference_desk/Archives/Mathematics/2009 June 16


 * 1) rule finding
 * 2) Area of a circle
 * 3) How many baseball games total in a season?
 * 4) Voting algorithm
 * 5) Is one number a power of the other? Time efficiency
 * 6) Is this construction possible?
 * 7) Complex integration blues
 * 8) Area of a sector
 * 9) Product of contiguous sets
 * 10) Summation

= June 17 = Reference_desk/Archives/Mathematics/2009 June 17


 * 1) A simple riddle.
 * 2) name of math concept
 * 3) volume of a sack
 * 4) Enigma puzzle from New Scientist magazine

= June 18 = Reference_desk/Archives/Mathematics/2009 June 18


 * 1) Converting a floating point number to an integer using basic arithmetic
 * 2) Interior
 * 3) Continuous functions without known primitive ?
 * 4) The torus double-covers the sphere

= June 19 = Reference_desk/Archives/Mathematics/2009 June 19


 * 1) Riemann Zeta Function
 * 2) Integral and series
 * 3) Bernoulli numbers
 * 4) friction
 * 5) Statisics (PCA):  Can we have a PCA-based reconstruction that includes negative weighting of some sensors that express only a postive physical quantity?
 * 6) A trig equation

= June 20 = Reference_desk/Archives/Mathematics/2009 June 20


 * 1) Approximation
 * 2) Car dynamics
 * 3) Necessary and sufficient conditions
 * 4) Maximizing the volume in a certain class of sets

= June 21 = Reference_desk/Archives/Mathematics/2009 June 21


 * 1) Finding the median of a continuous random variable
 * 2) Induction
 * 3) N-deck hearts

= June 22 = Reference_desk/Archives/Mathematics/2009 June 22


 * 1) Linear topological space
 * 2) The gambler's fallacy
 * 3) question on stats
 * 4) Door codes

= June 23 = Reference_desk/Archives/Mathematics/2009 June 23


 * 1) Limits
 * 2) Enumerating Rationals
 * 3) Inequality
 * 4) Empty mean

= June 24 = Reference_desk/Archives/Mathematics/2009 June 24


 * 1) Normal distribution curves from two values.
 * 2) Bezier curve with width
 * 3) Find an array of numbers, max_i and max_j being given
 * 4) poker odds

= June 25 = Reference_desk/Archives/Mathematics/2009 June 25


 * 1) two questions
 * 2) Chain Rule for Matrices
 * 3) Integral is 0 on any interval
 * 4) 36 standard deviations away from the mean on a normal distribution

= June 26 = Reference_desk/Archives/Mathematics/2009 June 26


 * 1) Small World Experiment

= June 27 = Reference_desk/Archives/Mathematics/2009 June 27


 * 1) sample path
 * 2) Algebraic equation
 * 3) Resolving ties in Ranked Pairs
 * 4) Measurable functions on [0,1]

= June 28 = Reference_desk/Archives/Mathematics/2009 June 28


 * 1) Divisible by 126
 * 2) calculate pi with hot dogs

= June 29 = Reference_desk/Archives/Mathematics/2009 June 29


 * 1) dependency with a fractional exponent

= June 30 = Reference_desk/Archives/Mathematics/2009 June 30


 * 1) Linear functionals
 * 2) Unemployment vs. application rate
 * 3) "Scoring" a product, correcting for incomplete scores.
 * 4) Expected value of the reciprocal of the gcd
 * 5) Calculating residues
 * 6) Double integral = 0 over all rectangles