1,979 reputation
1229
bio website benalpert.com
location Mountain View, CA
age
visits member for 4 years
seen Jul 28 at 8:33

I'm a software developer originally from Boulder, CO, currently working at Khan Academy in Mountain View, CA. In my spare time, I contribute to React, make music, and cook.


Jul
30
accepted Which average to use? (RMS vs. AM vs. GM vs. HM)
Jul
30
revised Which average to use? (RMS vs. AM vs. GM vs. HM)
edited body
Jul
30
comment Which average to use? (RMS vs. AM vs. GM vs. HM)
(Couldn't decide whether or not this is appropriate for this site; vote to close at will.)
Jul
30
asked Which average to use? (RMS vs. AM vs. GM vs. HM)
Jul
30
comment Proof that $n^3+2n$ is divisible by 3
Indeed. If you do enough problems like this, then at least tricks like this become second nature.
Jul
30
revised Proof that $n^3+2n$ is divisible by 3
edited body
Jul
30
comment Counting how many hands of cards use all four suits
This is a fantastic solution that I hadn't thought of. Thanks!
Jul
30
accepted Counting how many hands of cards use all four suits
Jul
30
comment Are the “proofs by contradiction” weaker than other proofs?
Related: math.stackexchange.com/questions/198.
Jul
30
answered Proof that $n^3+2n$ is divisible by 3
Jul
30
revised Proof that $n^3+2n$ is divisible by 3
added 357 characters in body
Jul
30
answered Proof that $n^3+2n$ is divisible by 3
Jul
28
answered How do I convert from Cartesian to conical coordinates?
Jul
27
awarded  Beta
Jul
27
comment Proof of Angle in a Semi-Circle is 90 degrees
Nice! Hadn't seen this proof before.
Jul
25
awarded  Mortarboard
Jul
25
comment Probability that two people see each other at the coffee shop
Tom Stephens: In Mathematica, you can generate the above plot by running RegionPlot[x - 1/3 < y < x + 1/3, {x, 0, 1}, {y, 0, 1}, FrameTicks -> {{0, 1/3, 2/3, 1}, {0, 1/3, 2/3, 1}}] then selecting Save Graphic As… from the right-click menu to make a PNG. If you don't have Mathematica, you'll need to find some other tool.
Jul
25
comment How can I randomly generate trees?
And now there's no http://, which you need to make it a link. (I had it in my comment but it was stripped out.)
Jul
25
comment Probability that two people see each other at the coffee shop
I don't know which classes you're taking where this is a common homework question, but I just really like the graphical solution for this problem and so I thought I'd ask it so that someone could put up the solution.
Jul
25
accepted Picking cakes if we need at least one of each type