Write a function to determine whether or not the matrix is a projector. Projector matrices are defined as P^2 = P.
test 8 is not a symmetric matrix, is it a projector matrix?
Sorry about that one. I've removed that test case. I don't know how long it will take for the re-scoring to propagate, though.
Remove all the words that end with "ain"
Project Euler: Problem 10, Sum of Primes
Create a vector whose elements depend on the previous element
Divisible by 4
Lights Out 19 - 3x3, x moves
Singular Value Decomposition
Lights Out 34 - m x n x o, q stages, with wrapping, x moves
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