637 reputation
517
bio website
location Reno, NV
age 23
visits member for 3 years
seen Oct 8 at 10:06

I'm a math/programming teacher and freelance programmer. My first language was Scheme, and I have a major soft spot for functional programming. I read SICP every year and do all of the exercises (so I'm pretty good at hw-type problems.)


Jan
15
revised Trapezoid Root Mean Square
added 38 characters in body
Jan
15
revised Trapezoid Root Mean Square
Clarity
Jan
15
comment Trapezoid Root Mean Square
Sorry, I'd like a hint. I'll amend the question to make it more clear.
Jan
15
asked Trapezoid Root Mean Square
Dec
28
revised Preparing for Spivak
spelling
Dec
28
comment Balls in an urn : Can't figure out.
6 choose 3 over counts, as not all of the balls are distinct.
Dec
28
revised Logic puzzle - problem 298, linked below
Better argument
Dec
28
revised Logic puzzle - problem 298, linked below
Expanded
Dec
28
answered Logic puzzle - problem 298, linked below
Dec
28
answered Combinatorics with n case
Dec
27
awarded  Yearling
Dec
27
comment If Bob and Alice never met in class, at least one of them missed at least half of the classes
Nicely done. I think this is prettier than mine.
Dec
27
revised If Bob and Alice never met in class, at least one of them missed at least half of the classes
Edited for clarity
Dec
27
revised If Bob and Alice never met in class, at least one of them missed at least half of the classes
Edited for clarity
Dec
27
comment If Bob and Alice never met in class, at least one of them missed at least half of the classes
I addressed that in the last paragraph. It doesn't matter if they collectively attended all the lectures or not. The argument still holds. I'll reformulate my argument a bit.
Dec
27
answered Identifiying the next point on the surface of a cube ( or 3D object )
Dec
27
comment If Bob and Alice never met in class, at least one of them missed at least half of the classes
I don't think this is right. I don't think you're counting the lectures correctly. Bob and Alice could both be missing from the lectures. If you subtract the number of lectures missed by Bob, you're also subtracting the number of lectures missed mutually by Bob and Alice. Even then, doesn't this just show that of the missed lectures someone had to have missed at least half of the missed lectures?
Dec
27
answered If Bob and Alice never met in class, at least one of them missed at least half of the classes
Dec
25
comment Help understanding passage from combinatorics book.
Wow that was really dumb of me. Thanks. It's always something like that. That wasn't specified, but now it makes perfect sense.
Dec
25
accepted Help understanding passage from combinatorics book.