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Jul
1
comment Why are the only division algebras over the real numbers the real numbers, the complex numbers, and the quaternions?
@Assad that proof is indeed simple — but gives a proof only of a much weaker statement, AFAICS (only about dim=3)
Jun
30
reviewed Close Word problem to help me in my math class
Jun
30
reviewed Looks OK Evaluating the indefinite integral $\int\log\!\left(x+\sqrt{x^2-1}\right)\!dx$
Jun
30
reviewed No Action Needed Difficulty understanding the concept of writing an L-System?
Jun
30
reviewed Close How can you evaluate $\lim_{x \to 2} \frac{x^3-8}{x-2}$
Jun
30
reviewed Close What do we mean by 'defining a function'?
Jun
30
reviewed Leave Closed Connected set imply continuous boundary
Jun
30
reviewed No Action Needed How to factorize $x^3 - 7x + 6$?
Jun
30
reviewed Leave Closed prove function is well-defined and integrable
Jun
30
reviewed Close what is the fundamental group of a torus with $k$ points removed
Jun
30
reviewed Close Find the fundamental group of torus with two points removed
Jun
29
reviewed Reopen Probability of a nonnegative submartingale converging to zero
Jun
29
reviewed Leave Closed How to move a point onto a line, but leave it alone if it is already on the line?
Jun
29
reviewed Leave Closed Please explain in detail how to prove $\lim_{x\to 1} x^2 + 2x +3 = 6$ using only the definition of limit
Jun
29
reviewed Leave Closed How to read subset notation in theorems?
Jun
29
reviewed Leave Closed Partial derivative of $f(t,r)$ with respect to the new variable $z=t/r$
Jun
29
reviewed Looks OK Prove that exist $e_1,\dots,e_n\in\{-1,1\}$ such that $|e_1z_1+{\dots}+e_nz_n|\le\sqrt2$
Jun
28
reviewed Close Noncommutative algebraic operation.
Jun
28
reviewed No Action Needed Probability that all colors are chosen
Jun
28
accepted Strehl identity for the sum of cubes of binomial coefficients