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.
give nth decimal place of pi
Reverse the vector
How to subtract?
Sum of series II
Divisible by 11
Self-similarity 3 - Every other pair of terms
Word Distance - Sum
Rule of mixtures (composites) - either bound
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