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awarded  Enlightened
14h
awarded  Nice Answer
Jul
5
accepted Sum of quotients
Jul
5
comment Sum of quotients
Why can we assume that these tuples are ordered? We have $x_i\leq y$ but not $x_i\leq x_{i+1}$.
Jul
5
comment Show that $\sup (A\cdot B)=\max\{\sup A\cdot\sup B, \sup A\cdot\inf B,\inf A\cdot\sup B,\inf A\cdot\inf B\}$
It is not true that $\sup(A\cdot B)=\sup A\cdot \sup B$ if $\sup A>0$ and $\sup B>0$. See for example $A=\{1,-2\},B=\{1,-2\}$ then $\sup(A\cdot B)=4$.
Jul
4
reviewed Approve Special case on counting in a string of 7 letters
Jul
4
asked Sum of quotients
May
19
awarded  Popular Question
Apr
14
awarded  Nice Answer
Nov
25
awarded  Popular Question
Nov
4
awarded  Yearling
Sep
30
awarded  Explainer
Aug
8
awarded  Notable Question
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
27
comment A finite sequence of natural numbers, whose sum equal its product:
@barakmanos I don't think it is a stupid question at all.
Jun
10
revised How to compute the average weight of an undirected graph?
added 40 characters in body
Jun
10
answered How to compute the average weight of an undirected graph?
Jun
9
answered Why is this limit equal to $0$?
Apr
9
comment For which values of $k$, we have $A = A^{-1}$?
@ellya it is not bad etiquette but if you fully answer very simple questions it is likely that you do more harm than good to the asker.