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.
The Goldbach Conjecture, Part 2
Distance walked 3D
Find perfect placement of non-rotating dominoes (easier)
Wrapping the Tower of Pisa
Is It a Palindrome?
Lights Out 12 - 5x5, three stages, <7 moves
Lights Out 14 - 5x5, four stages, x moves
Is it really a 5?
Stress-Strain Properties - 7
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