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 Yearling
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Aug
1
reviewed Leave Closed Are there any open mathematical puzzles?
Aug
1
reviewed Close What is Gamma function?
Aug
1
comment What is Gamma function?
see also Understanding the Gamma function?
Jul
22
reviewed Leave Closed Can $1=0$ ever make sense?
Jul
22
reviewed Close What is the unit digit in $(3547)^{153} \cdot (251)^{72}$
Jul
21
awarded  Yearling
Jul
11
reviewed Leave Closed One Square and one straight line(pipe)
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 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 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 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 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.