Wikipedia:Reference desk/Archives/Mathematics/June 2009

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June 1

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 1

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

June 2

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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

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 3

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

June 4

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 4

  1. Cirumference of a circle

June 5

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 5

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

June 6

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 6

  1. Separated/connected equivalence
  2. Spherical wedge

June 7

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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

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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

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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

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 10

  1. Solution to a nonlinear ODE
  2. Topology question

June 11

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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

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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

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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

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 14

  1. alzebra quary of 9 standard

June 15

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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

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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

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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

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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

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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

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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

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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

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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

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 23

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

June 24

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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

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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

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 26

  1. Small World Experiment

June 27

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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

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 28

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

June 29

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Wikipedia:Reference_desk/Archives/Mathematics/2009 June 29

  1. dependency with a fractional exponent

June 30

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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