Wikipedia:Reference desk/Archives/Mathematics/July 2009

= July 1 = Reference_desk/Archives/Mathematics/2009 July 1


 * 1) Triangle with all angles less than 180º
 * 2) MathPsy and QuantPsy: Difference
 * 3) Solve for z

= July 2 = Reference_desk/Archives/Mathematics/2009 July 2


 * 1) The empty function
 * 2) Safety Stock Formula
 * 3) I don't understand why the sign changes when grouping polynomials for factoring.

= July 3 = Reference_desk/Archives/Mathematics/2009 July 3


 * 1) Development of calculus
 * 2) Method to solve 3-variable equation
 * 3) Mininmum Sample size for correlation study
 * 4) Connected component

= July 6 = Reference_desk/Archives/Mathematics/2009 July 6


 * 1) Del
 * 2) Isomorphism
 * 3) question about computer library programs for solving partial differential equations

= July 7 = Reference_desk/Archives/Mathematics/2009 July 7


 * 1) Take pity on the statistics illiterate
 * 2) Probability in card games
 * 3) Inverse of a Matrix Mod 2
 * 4) Understanding the basic quadratic formula proof
 * 5) Solving the differential equation

= July 8 = Reference_desk/Archives/Mathematics/2009 July 8


 * 1) Raise a matrix to a matrix power

= July 9 = Reference_desk/Archives/Mathematics/2009 July 9


 * 1) Calculating time to full battery recharge

= July 10 = Reference_desk/Archives/Mathematics/2009 July 10


 * 1) Practical uses of very big numbers
 * 2) Complex logarithm
 * 3) Quaternion algebra
 * 4) non base 10 math
 * 5) question about 0.333...
 * 6) Distance between points -- using lat/lon

= July 13 = Reference_desk/Archives/Mathematics/2009 July 13


 * 1) Points on square grid
 * 2) Average of the first billion digits of the decimal expansion of Pi
 * 3) Randomly choosing one object out of a countably infinite set

= July 14 = Reference_desk/Archives/Mathematics/2009 July 14


 * 1) Proving inequalities
 * 2) regarding Bernoulli trials
 * 3) Simplifying this sum

= July 15 = Reference_desk/Archives/Mathematics/2009 July 15


 * 1) Bounded variation
 * 2) elliptical tube cuts a plan
 * 3) functions
 * 4) Equation solving
 * 5) test edit

= July 16 = Reference_desk/Archives/Mathematics/2009 July 16


 * 1) Change the subject of equation
 * 2) Continuity and differentiability
 * 3) Unique representation of an element of a local ring
 * 4) Rope cutting formula?
 * 5) Subspace complemented -> Hilbert space

= July 17 = Reference_desk/Archives/Mathematics/2009 July 17


 * 1) Asking people for their names
 * 2) Residue of exp(1/sin(z)) at z=0.

= July 18 = Reference_desk/Archives/Mathematics/2009 July 18


 * 1) Polynomial whose roots are powers of another polynomial
 * 2) Irreducibility of multivariate polynomials
 * 3) How does this work?

= July 19 = Reference_desk/Archives/Mathematics/2009 July 19


 * 1) Extrema Finding and Integral Transforms
 * 2) Π-like notation for tupling

= July 20 = Reference_desk/Archives/Mathematics/2009 July 20


 * 1) Magnitude of a vector in different units

= July 21 = Reference_desk/Archives/Mathematics/2009 July 21


 * 1) sizes of round objects
 * 2) Changing someone else homework
 * 3) Estimate of Perron-Frobenius Theorem

= July 22 = Reference_desk/Archives/Mathematics/2009 July 22


 * 1) Showing inverse of a bijective holomorphic function on open set is holomorphic

= July 23 = Reference_desk/Archives/Mathematics/2009 July 23


 * 1) A variation of the knapsack problem
 * 2) Units
 * 3) Max mod principle problem
 * 4) Multiple regression v. neural nets

= July 24 = Reference_desk/Archives/Mathematics/2009 July 24


 * 1) population proportion

= July 27 = Reference_desk/Archives/Mathematics/2009 July 27


 * 1) Atoms in measure theory
 * 2) Statistical terms.
 * 3) Chaos
 * 4) Easter eggs in baskets
 * 5) Representing an affine transformation
 * 6) Lebesgue Density
 * 7) A beautiful solution?

= July 28 = Reference_desk/Archives/Mathematics/2009 July 28


 * 1) Right or left continuity, convergent sequence definition
 * 2) Graph
 * 3) Orthogonal Arrays and Codes
 * 4) is it statistically possible to tell which is the world's best poker bot?  whether it's better than the world's best Poker player?  who the latter even is?
 * 5) above question simplified:  "Does a poker tournament reach statistical significance"
 * 6) Book recommendations?
 * 7) An alternate solution by radicals to the Quartic Equation
 * 8) Monty Hall problem

= July 29 = Reference_desk/Archives/Mathematics/2009 July 29


 * 1) Sin Graph
 * 2) Calculating a limit explicitly.
 * 3) Product measure article/question
 * 4) Gompertz function right asymptote

= July 30 = Reference_desk/Archives/Mathematics/2009 July 30


 * 1) group isomorphism
 * 2) irreducibility

= July 31 = Reference_desk/Archives/Mathematics/2009 July 31


 * 1) Bay window measurement
 * 2) Picking four true properties of population mean - identified three, but stuck on the last.
 * 3) hypothesis tests
 * 4) Bilateral statistical hypothesis test
 * 5) Finding sample size