What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Make a Palindrome Number
calculate linear convolution two vectors
Check if equal
Replace every 3rd element in a vector with 4
Compute LOG(1+X) in natural log
Find out sum and carry of Binary adder
Find out output of following expression
Find out base of following arithmetic operation
Delete 2nd and 5th column of Given 6*6 matrix
Append two matrix as shown below example
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