Jump to content

Wikipedia:Reference desk/Archives/Mathematics/January 2009

From Wikipedia, the free encyclopedia
<< Dec | Mathematics desk | Feb >>
Welcome to the Wikipedia Mathematics Reference Desk Archives
The page you are currently viewing is a monthly archive index. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages.



January 1

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 1

  1. Simple permutations/combinations?

January 2

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 2

  1. Modular arithmetic into which the primes fit neatly

January 3

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 3

  1. Fractal line
  2. What is the expected value of the lowest of four numbers?
  3. lease money factor

January 4

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 4

  1. Sir Isaac Newton

January 5

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 5

  1. Discussion for On-Line Algebra

January 6

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 6

  1. Product (not normal) symbol in LaTeX
  2. does 0.999... equal 1 ?
  3. max size of disconnected graph
  4. roots of y=0 and definitions
  5. Determining size of label for cylindrical bottle

January 7

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 7

  1. Estimation problem

January 8

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 8

  1. Group Axioms
  2. Original research and WP:OR
  3. Seeking a definition of "Positive Terms"
  4. Question relating to the discriminant

January 9

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 9

  1. a question regarding liters and milliliters
  2. Is this equation solveable without a computer/brute force?
  3. Algebra II word problem

January 10

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 10

  1. Does this continued fraction converge?
  2. Pentagons
  3. max size of a k-component graph
  4. Multiplying integers by digit-swapping.
  5. 3x3 Antisymmetric Matrices
  6. Three '2's Problem

January 11

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 11

  1. Group of points on the unit sphere
  2. Unidentified trig functions/identities?
  3. Conic section slope of directrix
  4. Cubic functions
  5. Manifolds

January 12

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 12

  1. A Pascal's triangle question I've never seen before
  2. Leibniz notation
  3. Lebesgue Integrals
  4. [[Wikipedia:Reference_desk/Archives/Mathematics/2009 January 12#ei<.2Fsup>|ei]]
  5. combination and permutation
  6. Law of excluded middle

January 13

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 13

  1. the complex plane
  2. is a straight line a right angle triangle?
  3. Lefschetz numbers
  4. Interest calculation (discontinuous)
  5. Convolution

January 14

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 14

  1. Sphere specialists?
  2. Modeling using overlapping probability distributions
  3. definition for geometry situation

January 15

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 15

  1. Trivial questions and removal of posts
  2. Interesting geometric and probability question

January 16

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 16

  1. Probability and the universe
  2. If a coefficient is significantly different from 1.00
  3. Arclength
  4. Matrix
  5. Basic math elements
  6. Measureable sets
  7. check

January 17

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 17

  1. Exam on Wednesday! Help me!
  2. category has fibre products => has equalisers?
  3. Spider pursuing a fly on the net of a polyhedron
  4. Balls

January 18

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 18

  1. 3 spiders and a fly
  2. volume of a nonEuclidean tetrahedron
  3. Infinity multiplied by zero
  4. [[Wikipedia:Reference_desk/Archives/Mathematics/2009 January 18#the square root of ]]
  5. Henge circles
  6. Continued fractions and quadratic irrationals
  7. One cannot reconstruct a finite group from its character table

January 19

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 19

  1. math coincidence
  2. Level in a horizontal cylinder
  3. Meaning of 'deviated from their sample means'
  4. A question about consistent mass matrices in Finite Element Analysis

January 20

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 20

  1. Geometry problem
  2. Ordinary Annuity
  3. Positive roots of subsystems

January 21

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 21

  1. solving for radius?
  2. Diophantine
  3. [[Wikipedia:Reference_desk/Archives/Mathematics/2009 January 21#Integrals ∫a<.2Fsub>∏f(xn<.2Fsub>)dxn<.2Fsub>|Integrals ∫a∏f(xn)dxn]]
  4. What do you call a + or - sign (to indicate positive or negative numbers)?
  5. Math, via Civil Engineering
  6. Transcentdental numbers

January 22

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 22

  1. about infinity
  2. Physics: power of water pump
  3. Commuting elements in SO(3)
  4. Physics: Work from force on inclined plane
  5. Compound compound Poisson Distribution
  6. Generalised Gauss-Bonnet theorem

January 23

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 23

  1. logical numerical order to follow
  2. circles

January 24

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 24

  1. would you give credit?
  2. why is mathematics a requirement
  3. Alternative inequality symbols and logic

January 25

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 25

  1. Riemann Surface for Dummies
  2. simple quadrilateral from distance matrix
  3. Unity
  4. Question about probability and ergodicity

January 26

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 26

  1. Turkish numerals
  2. zero divisors in non-commutative rings
  3. electric watts to amps
  4. [[Wikipedia:Reference_desk/Archives/Mathematics/2009 January 26#What is ?]]
  5. [[Wikipedia:Reference_desk/Archives/Mathematics/2009 January 26#What is 00<.2Fsup>?|What is 00?]]
  6. Variable Changing in Multiple Integrals
  7. Definition for │x│
  8. Many-body problems
  9. Roman numerals on watch dials
  10. Lim sup of number of divisors
  11. Notation

January 27

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 27

  1. Rotating a Right Traingle 180 Degrees
  2. Weierstrass-Enneper parametrization
  3. College Math Help!
  4. why not fermats last conjecture
  5. Wake Angle
  6. Co-ordinate geometry
  7. saving time
  8. Evaluate trigonometric definite integral

January 28

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 28

  1. Notation used in Wikipedia article "Prime Gap"

January 29

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 29

  1. Proven but not constructed
  2. Some Number Theory
  3. Sum of interior angles of polygons constant - proof?
  4. Numerical error
  5. sin(G)

January 30

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 30

  1. Calc 1 Question
  2. Common name for spheres and circles.
  3. Rotation along a certain point...
  4. Curiosity has revived the calculus - A math homework from yesteryear

January 31

[edit]

Wikipedia:Reference_desk/Archives/Mathematics/2009 January 31

  1. formula to calculate pi
  2. Euler's proof that god exists
  3. Localization Morphism
  4. elementary graph theory
  5. Modular arithmetic/number theory
  6. Vectors & Potentials