Wikipedia:Reference desk/Archives/Mathematics/December 2008

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December 1

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 1

1. Ackermann vs. tetration
2. Unbounded utility
3. Root at top of tree?
4. Wireframe cube result

December 2

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 2

1. Integral of graph, area = infinite, volume = finite?
2. calculator for e
3. Hyperbola and its Tangent Line
4. Rearranging for x
5. Group of a given order

December 3

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 3

1. Trapezoid
2. Ratio Proportion Problem
3. Last two digits of a given index
4. Standard Error of Products
5. Basis of K(x)
6. Is PlanetMath a valid source?
7. Mathematical symbols like < and > but with curved lines
8. a*x=b (mod N)

December 4

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 4

1. [[Wikipedia:Reference_desk/Archives/Mathematics/2008 December 4#$x^{4}=4^{x}$]]
2. A question in trivialogy.
3. The finite fields are completely known

December 5

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 5

1. How can you tell when you have correct digits of pi in equations with limits?
2. statistical significance and Wikipedia:Arbitration Committee Elections December 2008/Results
3. The Fabulous number i

December 6

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 6

1. Inequality
2. simple productivity calculation
3. half functions
4. Large Counterexamples and Proof by Induction

December 7

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 7

1. Measure Theory
2. Finding root-mean-square error for various methods
3. Topology question
4. Asking the gods of science for some help.
5. How many groups are there of a particular order?
6. Graph Sketching

December 8

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 8

1. Infinite Box
2. Elliptic Curve Cryptography Problem...
3. Mallows' Cp
4. Tax question
5. Well-orderings of an aleph-1 set
6. Mapping circle to heart shape curve and cardioid

December 9

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 9

1. 6th grade math
2. Proof
3. Small but not finite fields

December 10

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 10

1. Reciprocal of a graph
2. Trigonometric identities
3. Constructing a square around a Reuleaux triangle

December 11

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 11

1. Functions
2. Integration problem
3. Reuleaux triangle
4. Functions
5. What is a "cz" a unit of?
6. Reciprocal of a distance time graph

December 11

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 11

1. Functions
2. Integration problem
3. Reuleaux triangle
4. Functions
5. What is a "cz" a unit of?
6. Reciprocal of a distance time graph

December 12

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 12

1. Smallest power with a given property
2. Solution sought
3. π = –i log(–1) ?
4. Mathematics Question

December 13

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 13

1. Is PlanetMath a valid source?
2. Continued fraction
3. Geometric shapes
4. Measure Theory questions

December 14

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 14

1. Decidability of God
2. Partial differencial equation
3. Fixed Points
4. Closures and cluster points

December 15

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 15

1. Integral question
2. A property of the adjugate
3. Problem
4. Function of best fit for these couples; and a general question

December 16

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 16

1. Category Theory question from Mac Lane's book
2. How many subtractions do you need to obtain number 32, using the numbers 1, 5, 6, 7 and 9?

December 17

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 17

1. Number of subsets of size k
2. REVISITED: How many subtractions do you need to obtain number 32, using the numbers 1, 5, 6, 7 and 9?
3. Rational inequalities

December 18

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 18

1. Simple probability

December 19

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 19

1. Probability regularisation
2. Boubaker polynomials

December 20

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 20

1. Boubaker polynomials (2)
2. List of exact values of trig functions
3. On/Off Notation

December 21

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 21

1. Feynman Restaurant Problem
2. Socks in drawer problem
3. Boubaker polynomials (3): Mr. Boubaker, please come and give your personal definition

December 22

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 22

1. What is the factorial of a fraction and a fractionth triangular number?
2. Refs for group theory: realizability as derived or frattini subgroup
3. Probability

December 23

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 23

1. 1 + 1 = 0?
2. Latex with WinShell, regular expressions
3. Determinants of a Non-Square Matrix!!!
4. Angles of points on surface of sphere

December 24

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 24

1. Derivation details
2. Möbius strip
3. Annuity
4. Stirling's approximation and asymptotics

December 26

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 26

1. inequality involving a sequence
2. Relation between trigonometric functions and exponential / multiplicative reciprocal functions
3. acromegly
4. maths quiz
5. maths quiz

December 27

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 27

1. Square numbers

December 28

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 28

1. math question

December 29

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 29

1. Jet interpolation, or what?
2. MY DOUBTS
3. Summing 1's and 2's
4. acromagaly chances
5. on analytical geometry
6. inverting pixels with convolution matrix
7. Composition of polynomials is associative

December 30

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 30

1. Factorization
2. Hypersudoku question
3. Polynomial
4. Question concerning two integrals
5. [[Wikipedia:Reference_desk/Archives/Mathematics/2008 December 30#Equations for Π^{n<.2Fsup>_{i=a<.2Fsub>f(x) and Σn<.2Fsup>i=a<.2Fsub>f(x)|Equations for Πni=af(x) and Σni=af(x)]]}}
6. [[Wikipedia:Reference_desk/Archives/Mathematics/2008 December 30#Extension of Σ^{n<.2Fsup>_{i=a<.2Fsub>f(x) and Πn<.2Fsup>i=a<.2Fsub>f(x) for n≠xINT1 or n≠an integer|Extension of Σni=af(x) and Πni=af(x) for n≠xINT1 or n≠an integer]]}}
7. Collatz conjecture
8. Triangle wave
9. Trigonomic approximation revisited

December 31

Wikipedia:Reference_desk/Archives/Mathematics/2008 December 31

1. Proof that a function from the rationals to dyadic rationals is a bijection
2. Uncountability of x S.T. f(x)=0
3. [[Wikipedia:Reference_desk/Archives/Mathematics/2008 December 31#S^{3<.2Fsup> vs P3<.2Fsup>|S3 vs P3]]}