Wikipedia:Reference desk/Archives/Mathematics/July 2009

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style="background: #5D7CBA; text-align: center; font-family:Arial; color:#FFFFFF;" | Welcome to the Wikipedia Mathematics Reference Desk Archives
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= July 1 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 6

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

= July 7 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 8

1. Raise a matrix to a matrix power

= July 9 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 9

1. Calculating time to full battery recharge

= July 10 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 14

1. Proving inequalities
2. regarding Bernoulli trials
3. Simplifying this sum

= July 15 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 19

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

= July 20 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 20

1. Magnitude of a vector in different units

= July 21 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 22

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

= July 23 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 24

1. population proportion

= July 27 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia: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 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 July 30

1. group isomorphism
2. irreducibility

= July 31 =

Wikipedia: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