Wikipedia:Reference desk/Archives/Mathematics/September 2009

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September 1

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 1

1. Integration
2. Hyperbolic Functions

September 2

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 2

1. Variables confusing me
2. Continuation of the Method of Characteristics to solve PDEs
3. Period
4. Non-Archimedean fields

September 3

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 3

1. Econometrics
2. Binomial Expansions
3. Uniform convergence of exp(-x²)sin(x/n) over R

September 4

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 4

1. 12 people in a family, all with birthdays in different months
2. Canonical Forms for PDEs

September 5

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 5

1. The Sorgenfrey plane
2. Great retrosnub icosidodecahedron
3. Uniform Continuity of sin(x³)/(x+1)
4. Properties of an isosceles triangle
5. Dense in C
6. Divisor of a Riemann surface
7. Function elements

September 6

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 6

1. Evaluating a probability estimator
2. Automorphisms of Z[x]

September 7

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 7

1. Latex align* multiple points of alignment.
2. Reduction to Canonical Form
3. FRACTALS
4. Irreducible representations of signed permutations (double young diagrams?)
5. A^n*B^n ≠ (A*B)^n for matrices (get around)
6. A topological counterexample
7. Base Conversion
8. Presentation of dihedral group

September 8

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 8

1. set
2. The sorgenfrey plane 2
3. mathematics
4. Piecewise functions
5. Dihedral group of a polygon
6. Metric completion of a field
7. Poker and math
8. Hermite polynomials and Hermite Interpolation
9. Derivative of a function between matrices
10. Is this a hyperbola or...

September 9

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 9

1. Effect of type I vs Type II error cost difference
2. Why angle side angle?

September 10

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 10

1. Weaker variant of Schur for sum of two = irreducibles: two eigenvalues?
2. maths?
3. Paper towels

September 11

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 11

1. Matrices and equations
2. Irrational perfect set
3. Life expectancy of the oldest
4. Using discrete crime data points to estimate relative rates by geography
5. Differential equation

September 12

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 12

1. Simplify integral
2. what is the value of k that must be added to 7,16,43,79 so that they are in proportion?
3. Fourier Transforms

September 13

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 13

1. Path problem
2. Table puzzle
3. Sample space

September 14

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 14

1. chess variables and states
2. winning games
3. Why so many 20ps
4. Geometry question
5. integral approximation name
6. Probabilities of unobserved observations
7. Parabola in projective space

September 15

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 15

1. Box and Whisker Plot
2. Brain Teaser
3. Zeros of Derivatives

September 16

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 16

1. What is the correct pronunciation of George Pólya's last name?
2. How many combinations are there?
3. Interpretation help
4. Expectation

September 17

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 17

1. Formula for placing things equidistant along a circle circumference
2. help me ...it will safe my future..??
3. Writing Roman Numerals
4. Equation of oscillator - flat section

September 18

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 18

1. Substitution in the integral
2. A really brainy sum !!!!!

September 19

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 19

1. Field extensions
2. calculations over three years
3. Method to generate symmetries of a point lattice

September 20

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 20

1. Collection of six related primes
2. Normal approximation to the binomial with continuity correction

September 21

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 21

1. Set-builder notation and primes

September 22

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 22

1. Bouncing balls

September 23

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 23

1. Advanced geometry homewrok
2. Recruiting math exam questions...
3. Introduction to number theory
4. Calculating integrals (for use in probability theory)

September 24

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 24

1. My mathematical ability.
2. Moment Generating Function
3. Easy question
4. Solving systems of equations in three variables
5. Complex number

September 25

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 25

1. Number of possible permutations in the lottery
2. Null hypothesis "trueness"?
3. Isomorphism between the space of infinite R-valued sequences and the space of polynomials on R
4. Convergence of random variables in mean

September 26

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 26

1. Chess outcomes

September 27

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 27

1. Fictional Solar Eclipse Calculation
2. Derivative of a complex function

September 28

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 28

1. prove ~A /\ ~B from ~(A \/ B)
2. What is this "theory"/scheme called?
3. Conformal mapping question

September 29

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 29

1. Pair and more pairs
2. Ellipse theorem
3. Interest on Savings Account

September 30

Wikipedia:Reference_desk/Archives/Mathematics/2009 September 30

1. Solving a modular diophantine equation
2. Teminology request
3. Odds + probability