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12h
comment Why do both sine and cosine exist?
…and once you get to studying Fourier series, having a function that is even and a function that is odd proves convenient.
12h
comment Does this matrix operation hold?
How do you propose to subtract a vector from a matrix in the first place?
12h
revised On Weisner Method
edited tags
19h
comment Prove or disprove that the sum of two irrational numbers is irrational
It's like asking if a woman can both be pregnant and not pregnant…
Aug
28
comment Overlapping Polynomials
Consider what happens if you subtract the two "overlapping" polynomials. Unless the result is the zero polynomial, this violates the fundamental theorem of algebra.
Aug
28
revised Cauchy's Integral Formula for Cayley-Hamilton Theorem
deleted 2 characters in body
Aug
28
reviewed Reject difference between implicit and explicit solutions?
Aug
26
comment Common Math Mistakes Made by Scientists
+1; Kahan has talked about how a number of classical formulae perform very poorly when implemented numerically; his website has a number of examples.
Aug
26
comment Can Eisenstein Series output complex numbers?
I see; I had used the formula relating $E_2$ and the complete elliptic integral of the second kind (from Abramowitz and Stegun), but wound up with a function that inherited the branch cuts of $E(m)$; I'll test your route the next time I have a computer…
Aug
26
comment Can Eisenstein Series output complex numbers?
Hi, may I ask what you used for making these plots? They look lovely.
Aug
25
revised Convert from decimal to fraction
edited tags
Aug
25
revised Can exact numbers be written in scientific notation
edited tags
Aug
24
awarded  Necromancer
Aug
21
revised Best Quotes by a Mathematician
rolled back to a previous revision
Aug
20
comment How to convert a decimal to a fraction easily?
"and reduce" - would you be able to do the Euclidean algorithm quickly in a pinch?
Aug
20
revised Prove that $i^i$ is a real number
deleted 2 characters in body
Aug
20
revised closed-form expression for roots of a polynomial
added 51 characters in body
Aug
20
comment How do 3 points define a plane?
...three noncollinear points, yes. In proper Euclidean geometry, this is actually a postulate.
Aug
17
revised “A proof that algebraic topology can never have a non self-contradictory set of abelian groups” - Dr. Sheldon Cooper
edited tags
Aug
17
comment Is there an equation to describe regular polygons?
You're basically using $\arctan \cot x$ here as your sawtooth… :)