What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Make a checkerboard matrix
Project Euler: Problem 6, Natural numbers, squares and sums.
Project Euler: Problem 10, Sum of Primes
06 - Matrix Equations 1
Concatenate two strings
Add two different item as shown in example
Add one raw in given matrix as shown in example
Check transmitted data follow even parity (True or false)
Flip the vector from right to left
MATLAB Basic: rounding
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