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 Jan4 awarded Critic Sep27 comment Is there a name for functions that are their own inverses The most trivial involution is f(x) = x. Sep3 awarded Yearling Apr11 comment Units in this problem: velocity or distance? Even if the question were worded as "How far per...," the answer would still be 7.5 km. And trust me, we're way past the red mark point. Apr10 awarded Student Apr10 asked Units in this problem: velocity or distance? Nov5 comment Two paradoxes: $\pi = 2$ and $\sqrt 2 = 2$ @Graphth AHH, I see what he was doing there. The way that he convincingly misspoke and miswrote the expression confused me. Nov5 revised If $f(x)\leq f(f(x))$ for all $x$, is $x\leq f(x)$? improved formatting Nov5 comment Possible fake proof of $1= -1$ $\sqrt{-1\cdot-1}\neq\sqrt{-1}\sqrt{-1}$. If we replace $-1$ with $-2$ (just for good measure) and simplify, we arrive at $2\neq\sqrt{-2}\sqrt{-2}$, which seems reasonable enough. Nov5 answered Two paradoxes: $\pi = 2$ and $\sqrt 2 = 2$ Nov5 awarded Supporter Nov4 awarded Teacher Nov4 awarded Custodian Nov4 revised If $f(x)\leq f(f(x))$ for all $x$, is $x\leq f(x)$? deleted 72 characters in body Nov4 reviewed Approve If $f(x)\leq f(f(x))$ for all $x$, is $x\leq f(x)$? Nov4 awarded Editor Nov4 revised If $f(x)\leq f(f(x))$ for all $x$, is $x\leq f(x)$? added 5 characters in body Nov4 answered If $f(x)\leq f(f(x))$ for all $x$, is $x\leq f(x)$?