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Wikipedia:Reference desk/Archives/Mathematics/January 2010

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January 1

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 1

  1. Maths - discovered or invented?

January 2

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 2

  1. Original Basic Discovery or No?
  2. How to factorise
  3. Geometric algebra question - involutions
  4. Proof of continuity
  5. What's a mathematical coincidence?

January 3

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 3

  1. Generalized Heat Equation
  2. Diffusion Equation
  3. Formal sums for quotients of primorials

January 4

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 4

  1. conversions
  2. Cantor's Ordinal Numbers
  3. Term by Term Integration of a Fourier Series
  4. Sums of squares
  5. Rates of decline
  6. jection

January 5

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 5

  1. Convergence
  2. Question on combinations
  3. Möbius Maps
  4. NP and NPC

January 6

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 6

  1. Predicting number of items in a set (statistics)
  2. division by zero
  3. Quotients and products of topological spaces.
  4. Limits
  5. Extension fields
  6. How to solve for B
  7. Logarithms and order of operations

January 7

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 7

  1. TI 84 plus calculator program

January 8

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 8

  1. Simple Mathematics, Requiring Data
  2. Differentiable?
  3. Number of partitions of a set in classes of given cardinalities.
  4. Letter grid problem
  5. Limits

January 9

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 9

  1. Arrow's impossibility theorem and real elections
  2. 1001 (number)
  3. Pairwise coprime integers
  4. calculating pi
  5. Standard deviation of 4 numbers

January 10

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 10

  1. Sum
  2. Harmonic series

January 11

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 11

  1. Perimeter of a trapezium
  2. Smoothness Scale In Number Theory

January 12

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 12

  1. Normal Closures Qual. Exam
  2. solution of differential equation of motion of a quarter car
  3. Locally invertible function from R^2 to R
  4. Estimating number ratios

January 13

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 13

  1. Cube root function on the space Mn of matrices
  2. finding the centre of a circle
  3. Nilpotent homomorphisms
  4. 35 degrees east

January 14

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 14

  1. An elementary homotopy equivalence
  2. Consecutive integers with same sum of proper divisors

January 15

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 15

  1. Is there a name for this property of sets?
  2. Is a set that contains only itself hereditary?
  3. Continuity of power functions
  4. Infinite ordinals
  5. Properties of certain symmetric matricies?

January 17

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 17

  1. Archimidean Spiral Segment
  2. Identity Matrix Multiplication
  3. Weird summation notation
  4. Certain repeating digits

January 18

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 18

  1. Asians
  2. differential
  3. What does this symbol/suffix mean?

January 19

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 19

  1. Policy recommendation for comparing citation totals or h-index for any mathematician
  2. Variation on equals sign
  3. P.G.F. question
  4. 3 rotations about the vertices of a triangle: identity map

January 20

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 20

  1. Eigenvalues and eigenvectors
  2. Riemann integral
  3. A few more geometry problems!
  4. Geometry question

January 21

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 21

  1. Riemannian geometry
  2. Fractional chromatic number
  3. Expected value problem
  4. can you explain turbo codes OR LDPC?

January 22

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 22

  1. Weaker versions of Fermat's Last Theorem
  2. Bounds

January 23

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 23

  1. Finding a surface on which integrals of multiple functions are 0

January 24

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 24

  1. Query on an online document - subgroups of A5
  2. College question: What material do I need to have a firm grasp on?
  3. Factoring Polynomials
  4. Complex icosidodecahedrons

January 25

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 25

  1. Cryptography
  2. Differential equation
  3. Topological Group Question

January 26

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 26

  1. Inverse Trigonometric Identity Prove
  2. Cross ratio equal to 1/2tan^2 of spherical distnce
  3. I was wondering...
  4. Normed Spaces
  5. A loxodromoid?

January 27

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 27

  1. Calculating the area of a triangle while on a coordinate system
  2. Effective procedure
  3. Three little geometry puzzles
  4. sequence space
  5. Smooth structures (manifolds)
  6. Another triangle problem
  7. How to build an ellipse?

January 28

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 28

  1. Golden Ratio
  2. Reversion to the mean
  3. NP definition
  4. j-invariant

January 29

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 29

  1. Why is the perimeter of a spherical triangle less than 2 pi?
  2. Unique bid auctions
  3. Cardinality
  4. ratio inequality
  5. What algorithm?
  6. Proof
  7. Derivative question
  8. Monty hall paradox

January 30

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 30

  1. percentages,round offs and number based systerms
  2. could there be ANY change made in the rules of logic without immediate inconsistency?
  3. Hexadecimal

January 31

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Wikipedia:Reference_desk/Archives/Mathematics/2010 January 31

  1. Normal vectors
  2. Rhombicosidodecahedron
  3. Strange use of log
  4. Function harmonic on a strip
  5. Intersecting cylinders
  6. What is the link between the edges, faces and vertices of a 3D shape?
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