What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Is A the inverse of B?
06 - Matrix Equations 3
Compute Fibonacci Number
Generate vector according to sign of vector
Find the product of a Vector
calculate interest saved because of reduction of interest rate
Find out sum of all elements of given Matrix
Rotate Matrix @180 degree
Find out DC Gain of transfer function
Change the first and last diagonal element of the identity matrix to zero
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