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May
19
awarded  Revival
Apr
25
awarded  Civic Duty
Apr
18
answered If $f(t)$ is periodic, is there any $t$ that would equal to DC components?
Apr
5
awarded  Popular Question
Feb
18
answered In a finite field, is there ever a homomorphism from the additive group to the multiplicative group?
Dec
20
awarded  Caucus
Oct
7
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Sep
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Aug
19
answered Simulate repeated rolls of a 7-sided die with a 6-sided die
Aug
18
comment Simulate repeated rolls of a 7-sided die with a 6-sided die
@Daenyth: Huh? I see 35 non-X possibilities, 5 of them result in a 7, which gives the correct desired probability of 5/35 = 1/7 chance of resulting in a 7.
Aug
18
revised Simulate repeated rolls of a 7-sided die with a 6-sided die
clarified (I hope)
Aug
18
suggested approved edit on Simulate repeated rolls of a 7-sided die with a 6-sided die
Aug
18
comment Simulate repeated rolls of a 7-sided die with a 6-sided die
@cHao: Yes, sometimes we want exactly one fair 1d7 value, and you're right that it's impossible to do that with only 1 roll of a 1d6 dice -- we need at least 2, sometimes more, and andre shows an excellent algorithm for that case. However, if we want several hundred independent and fair 1d7 values, it is (theoretically) possible to derive those values from (on average) log(7)/log(6) =~ 1.09 rolls of a fair 1d6 die per desired 1d7 value. However, the algorithm to do that is complex and more difficult to prove that it gives fair, independent 1d7 values.
Jul
11
answered Why square units?
Jul
2
awarded  Curious
May
19
awarded  Nice Answer
May
19
answered Why square units?
May
2
comment Platonic solids and charged particles
@LeeMosher: Min-Energy Configurations of Electrons On A Sphere says that N = 16 electrons has 2 local minima, but only one of them is the unique global minimum.
Apr
28
comment A function such that $f(f(n)) = -n$?
@JackAidley: You are technically correct, but many people (apparently including corsiKa) still call the leftmost bit in signed 32-bit integers in practically all modern computers "the sign bit", even though it acts differently than the "real" sign bit in early Cray mainframes.
Apr
28
revised A function such that $f(f(n)) = -n$?
clarified (I hope) with another example.