The test set should contain a polynomial with complex roots where the real part is positive, and a polynomial with a positive and a negative root.
Too less test cases
This removes only polinomials if all the roots are positive. Should read 'all' instead of 'any' here.
How to subtract?
Permute diagonal and antidiagonal
Make a 1 hot vector
Switch matrix to a column vector
Select every other element of a vector
Swap the first and last columns
Sums with Excluded Digits
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