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 Mar15 awarded Yearling Dec19 awarded Caucus Nov28 awarded Inquisitive Nov27 accepted Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$? Nov27 comment Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$? The most understandable answer. :-) Thanks. Nov27 asked Is the empty set the only possible set for $A$ such that $A=\{x|x\not\in A\}$? Oct20 answered arrange m balls in to n baskets Sep30 awarded Explainer Sep23 reviewed Approve Which was defined first to represent $\underbrace{a+a+a+\cdots+a+a+a}_{n \text{ terms}}$? $n\times a$ or $a \times n$? Sep23 asked Which was defined first to represent $\underbrace{a+a+a+\cdots+a+a+a}_{n \text{ terms}}$? $n\times a$ or $a \times n$? Sep11 awarded Popular Question Aug27 asked Are there other methods to evaluate $\frac{1^{-4}+2^{-4}+3^{-4}+4^{-4}+\cdots}{1^{-4}+3^{-4}+5^{-4}+7^{-4}+\cdots}$? Aug19 awarded Popular Question Aug10 revised Is there a symbol that I can attach to a pair of line segments which are parallel and equal length? added 104 characters in body Aug10 asked Is there a symbol that I can attach to a pair of line segments which are parallel and equal length? Aug9 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. Aug9 comment How to test whether a set of four points can form a parallelogram How about the case there are 3 points on a line? Aug9 accepted How to test whether a set of four points can form a parallelogram Aug9 comment How to test whether a set of four points can form a parallelogram But all of your three tests may be false even though the given 4 points can be vertices of a parallelogram. Aug9 comment How to test whether a set of four points can form a parallelogram If $P_1$ is the opposite of $P_3$ then the last two tests are false. So the first test might be either false or true.