Write a function to determine whether or not the matrix is a projector. Projector matrices are defined as P^2 = P.
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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.
And I wonder which kind of code passes the case 1 in test 12, as well as case 3 in test 10. Also test 5.