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Jan
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awarded  Nice Question
Nov
12
awarded  Benefactor
Nov
11
accepted Characterizing sets with a function
Nov
11
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Nov
7
revised Characterizing sets with a function
added 11 characters in body
Nov
7
asked Characterizing sets with a function
Nov
6
comment Closure of a subset in a metric space
@ShinningStar you are right, I deleted my incorrect comment as the definition given in your comment is the intended one.
Nov
4
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Nov
1
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Oct
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awarded  Popular Question
Jul
30
awarded  Enlightened
Jul
30
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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
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14
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25
awarded  Popular Question