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 Feb 1 awarded Notable Question Jan 15 awarded Notable Question Oct 8 awarded Famous Question Jul 31 awarded Notable Question Jul 22 awarded Popular Question Apr 24 awarded Popular Question Mar 15 awarded Yearling Dec 19 awarded Caucus Nov 28 awarded Inquisitive Nov 27 accepted Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$? Nov 27 comment Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$? The most understandable answer. :-) Thanks. Nov 27 asked Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$? Oct 20 answered arrange m balls in to n baskets Sep 30 awarded Explainer Sep 23 reviewed Approve Which was defined first to represent $\underbrace{a+a+a+\cdots+a+a+a}_{n \text{ terms}}$? $n\times a$ or $a \times n$? Sep 23 asked Which was defined first to represent $\underbrace{a+a+a+\cdots+a+a+a}_{n \text{ terms}}$? $n\times a$ or $a \times n$? Sep 11 awarded Popular Question Aug 27 asked Are there other methods to evaluate $\frac{1^{-4}+2^{-4}+3^{-4}+4^{-4}+\cdots}{1^{-4}+3^{-4}+5^{-4}+7^{-4}+\cdots}$? Aug 19 awarded Popular Question Aug 9 comment How to test whether a set of four points can form a parallelogram We can save the calculation just by calculating the midpoint times 2 to avoid dividing by 2.