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17h
comment I think I see mysterious lines inside triangles—how to prove their existence?
Fourth paragraph, you probably meant $B_1A_1 // AB$.
Dec
22
awarded  Nice Answer
Sep
23
answered What is the smallest value of $x^2+y^2$ when $x+y=6$?
Jul
30
awarded  Yearling
Jul
28
answered Can the golden ratio accurately be expressed in terms of e and $\pi$
Feb
15
answered Formal proof for $(-1) \times (-1) = 1$
Dec
18
comment Can't argue with success? Looking for “bad math” that “gets away with it”
Maybe this could be explained? I had to Google for what it meant because I have never learned to write down a division like that.
Jun
4
awarded  Yearling
Apr
21
comment Getting the sequence $\{1, 0, -1, 0, 1, 0, -1, 0, \ldots\}$ without trig?
@bodacydo - your solution is not a solution; it never outputs -1.
Apr
15
answered Getting the sequence $\{1, 0, -1, 0, 1, 0, -1, 0, \ldots\}$ without trig?
Apr
15
comment Getting the sequence $\{1, 0, -1, 0, 1, 0, -1, 0, \ldots\}$ without trig?
Probably not the fastest, because there is (((x+3)>>1)&1) - ((x>>1)&1).
Jan
11
awarded  Nice Answer
Jan
10
awarded  Critic
Jan
10
awarded  Editor
Jan
10
revised Proving the inequality $e^{-2x}\leq 1-x$
shorter proof
Jan
10
awarded  Teacher
Jan
10
answered Proving the inequality $e^{-2x}\leq 1-x$
Dec
15
comment Fast 2D Line Triangle Intersection test
Sorry, please disregard; they're projection directions, all right.
Dec
15
comment Fast 2D Line Triangle Intersection test
For the fourth direction, don't you mean the vector normal to the line segment instead?
Nov
11
awarded  Supporter