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 Mar 24 awarded Famous Question Dec 3 awarded Popular Question Jun 23 awarded Self-Learner Jun 3 awarded Yearling Dec 19 awarded Constituent Dec 8 awarded Caucus Sep 30 awarded Explainer Jul 2 awarded Curious Jun 3 awarded Yearling Apr 1 comment Math contest: Find number of roots of $F(x)=\frac{n}{2}$ involving a strange integral. @ayesha Beijing, P.R.C. Mar 21 awarded Popular Question Jan 2 comment given the sequence: 2,-6,12,-20,30,-42,… $-a$=$(-1)\times a$, $(-1)\times(-1)=1$ Jan 1 revised Which prison cells will remain open in the following problem involving a drunken jailor? Formatting. Jan 1 comment Which prison cells will remain open in the following problem involving a drunken jailor? Correct answer. I'll never attempt to answer again when I feel dizzy :) Jan 1 suggested approved edit on Which prison cells will remain open in the following problem involving a drunken jailor? Jan 1 comment Which prison cells will remain open in the following problem involving a drunken jailor? Sorry for misread. Could you clarify "every ith cell"? E.g. every 5th cell, is opening (a) 1, 6, 11,... or (b) 5, 10, 15, ... ? Jan 1 comment Which prison cells will remain open in the following problem involving a drunken jailor? Hint: Opening $n$-th cell on $i$-th round means toggling (opening or shutting) other $n-1$ cells on the previous $i-1$ rounds. Jan 1 revised Term to describe the two ways of labeling the vertices of a tetrahedron. Reading it once more with a little bit of formatting. Jan 1 suggested approved edit on Term to describe the two ways of labeling the vertices of a tetrahedron. Jan 1 accepted Term to describe the two ways of labeling the vertices of a tetrahedron.