Wikipedia:Reference desk/Archives/Mathematics/October 2008

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October 1

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 1

1. Recurrence
2. algebra

October 2

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 2

1. Question related to .999...
2. Logic problem: Working out Wendy's birthdate
3. Continuity on the complex plane
4. Expressions
5. Find an analytic function f(z) such that f(f(z)) = exp(z)

October 3

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 3

1. Imaginary Numbers
2. Margin of error question...?
3. Please help in German–English maths translation
4. Grading on a Curve: Percents, Percentiles, and Z-Scores

October 4

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 4

1. request for solution for maths question
2. maths question
3. The logics of significance and insignificance
4. Definite matrix
5. "Undiscovered integer"?

October 5

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 5

1. Complexity of solving a sparse linear system

October 6

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 6

1. Solution manual
2. Julia set in nature

October 7

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 7

1. Name
2. Compass and Midpoint
3. Infinite increase
4. Correlation between shapes
5. side, edge of a circle
6. The 1-D Heat Equation
7. Simple statistics question

October 8

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 8

1. Minimizing first-time comparisons
2. Possible to solve this calculus problem?

October 9

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 9

1. Order of subgroups
2. Polarities
3. Combinations
4. simultaneous equations
5. Limit of an α-sequence

October 10

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 10

1. The real deal with fitting lines to observed data points
2. Use of atan2 in a maths article

October 11

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 11

1. 4th grade physics question (fluids, force, pressure)

October 12

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 12

1. Multiplying matrices of functions/arrays (in MATLAB)
2. Proving inequality for derivates (defined in Royden's Real Analysis)
3. Differentiation problem
4. Linear algebra puzzler
5. cost of transporting goods

October 13

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 13

1. Volume ratio
2. 1/x integral
3. help in editing gelfand pairs
4. Calculating a growth (or interest) rate
5. Dumb question about infinity
6. Solving equations
7. cardinality of unions

October 14

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 14

1. Additional question about infinites, related to the one posted above.
2. Expression for IDFT
3. I need help isolating a variable

October 15

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 15

1. The "bound"/"clamp"/? function
2. conjugate harmonic function
3. Simple problem re Future Value

October 16

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 16

1. 4
2. Vector problem in MATLAB

October 17

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 17

1. Logic problem
2. Tangents to circles
3. Complex Function
4. Diophantine Equation

October 18

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 18

1. [[Wikipedia:Reference_desk/Archives/Mathematics/2008 October 18#Equations of the form $acos{theta}=bsin{theta}<.2Fmath>|Equationsoftheform<math>acos{theta}=bsin{theta}$]]
2. Integration question...
3. Fourier transform in f instead of w (angular frequency) in Maple

October 19

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 19

1. The number of arithmetic progressions possible
2. [[Wikipedia:Reference_desk/Archives/Mathematics/2008 October 19#|]]
3. Countable metacompactness of the Sorgenfrey plane.

October 20

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 20

1. On hyperchains
2. Reflection
3. Help
4. the mathematician's personality.

October 21

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 21

1. dinner party problem
2. Points on a plane
3. Significant figures

October 22

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 22

1. Perfect square
2. Simultaneous linear equations
3. Is it true...
4. Parabola

October 23

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 23

1. Question about Collocation method
2. Math(s)?
3. Stat(s)?
4. Bounds on the Real Zeros of a Polynomial
5. efficient algorithm for converting an integer to a sum of four squares

October 24

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 24

1. Matroid morphism
2. Help with problem

October 25

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 25

1. Roulette Odds
2. Solving diophantine equations
3. NNOs

October 26

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 26

1. Dual Graph Problem...

October 27

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 27

1. Accepted convention for combining radians and degrees
2. Is this even possible?

October 28

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 28

1. Combinatorics problems
2. Induction of derivative of exponential functions
3. Combinatorial problem
4. Quick question about solving for factors

October 29

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 29

1. arc length
2. Asympotitic number of arithmetic progressions

October 30

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 30

1. Singularity functions in Ti-89/84+
2. Complementary integer sequences
3. The function of sines

October 31

Wikipedia:Reference_desk/Archives/Mathematics/2008 October 31

1. Mazes
2. My Theory that a fraction is a sum
3. group as a fundamental group
4. Functions with finite number of local extrema