FrenzY DT.
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 Dec19 awarded Constituent Dec8 awarded Caucus Sep30 awarded Explainer Jul2 awarded Curious Jun3 awarded Yearling Apr1 comment Math contest: Find number of roots of $F(x)=\frac{n}{2}$ involving a strange integral. @ayesha Beijing, P.R.C. Mar21 awarded Popular Question Jan2 comment given the sequence: 2,-6,12,-20,30,-42,… $-a$=$(-1)\times a$, $(-1)\times(-1)=1$ Jan1 revised Which prison cells will remain open in the following problem involving a drunken jailor? Formatting. Jan1 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 :) Jan1 suggested approved edit on Which prison cells will remain open in the following problem involving a drunken jailor? Jan1 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, ... ? Jan1 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. Jan1 revised Term to describe the two ways of labeling the vertices of a tetrahedron. Reading it once more with a little bit of formatting. Jan1 suggested approved edit on Term to describe the two ways of labeling the vertices of a tetrahedron. Jan1 accepted Term to describe the two ways of labeling the vertices of a tetrahedron. Jan1 asked Term to describe the two ways of labeling the vertices of a tetrahedron. Dec31 accepted The Puzzle of Locating Points in a Quadrilaterally-Faced Hexahedral Creature Dec30 comment The Puzzle of Locating Points in a Quadrilaterally-Faced Hexahedral Creature Note that for Q3, only 2 numbers are needed to address the coordinate, much like the step in Bilinear interpolation. So These 2 numbers can give the 4 weights. It's possible to solve for the two numbers using the inverse algorithm suggested in Q4. Interesting reading material. Dec30 comment The Puzzle of Locating Points in a Quadrilaterally-Faced Hexahedral Creature @MarkS. Nonetheless, I would appreciate any mathematical insight you are available to offer.