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Apr
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comment Math contest: Find number of roots of $F(x)=\frac{n}{2}$ involving a strange integral.
@ayesha Beijing, P.R.C.
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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.
Jan
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asked Term to describe the two ways of labeling the vertices of a tetrahedron.
Dec
31
accepted The Puzzle of Locating Points in a Quadrilaterally-Faced Hexahedral Creature