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location Beijing, China
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visits member for 2 years, 4 months
seen Oct 17 at 20:54

Mathematics is mysterious yet wonderful, wonderful yet mysterious.


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 suggested 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 suggested 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
1
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
Dec
30
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.
Dec
30
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.
Dec
30
comment The Puzzle of Locating Points in a Quadrilaterally-Faced Hexahedral Creature
@user4140 It gave away our tendency of raising eyebrows whenever other people asked something that looked like a homework. Presumed guilty.
Dec
30
revised The Puzzle of Locating Points in a Quadrilaterally-Faced Hexahedral Creature
Add a disclaimer that this is NOT a homework question and a trivial solution that does not meet the requirement.