Wikipedia:Reference desk/Archives/Mathematics/June 2009

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June 1

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 1

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

June 2

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 3

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

June 4

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 4

1. Cirumference of a circle

June 5

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 5

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

June 6

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 6

1. Separated/connected equivalence
2. Spherical wedge

June 7

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 10

1. Solution to a nonlinear ODE
2. Topology question

June 11

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 14

1. alzebra quary of 9 standard

June 15

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 21

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

June 22

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 23

1. Limits
2. Enumerating Rationals
3. Inequality
4. Empty mean

June 24

Wikipedia: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

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 26

1. Small World Experiment

June 27

Wikipedia: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

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 28

1. Divisible by 126
2. calculate pi with hot dogs

June 29

Wikipedia:Reference_desk/Archives/Mathematics/2009 June 29

1. dependency with a fractional exponent

June 30

Wikipedia: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