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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.
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
Jun
27
comment Is this problem correct?
also a duplicate of math.stackexchange.com/q/25701
Jun
27
reviewed Close What made you choose your research field?
Jun
27
reviewed Close Can I use my powers for good?
Jun
27
comment Show that $ \sum_{r=1}^{n-1}\binom{n-2}{r-1}r^{r-1}(n-r)^{n-r-2}= n^{n-2} $
That's called Abel[-Hurwitz] identity, I believe.
Jun
27
reviewed Leave Open Can ∂x and ∂y in a derivate be seen as ∂ times x or ∂ times y?
Jun
27
reviewed Leave Open Primitive recursion and $\Delta^0_0$
Jun
27
reviewed Close Predator Prey Model
Jun
27
reviewed Close Easy math proofs or visual examples to make high school students enthusiastic about math