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See the recommended documentation of this function
- S, P, D
integer (index of the zero eigenvalue of
Spectral characteristics of
A at 0.
S = reduced resolvent at 0 (
S = -Drazin_inverse(
P = spectral projection at 0.
D = nilpotent operator at 0.
index = index of the 0 eigenvalue.
(s*eye()-A)^(-1) = D^(i-1)/s^i +... + D/s^2 + P/s - S - s*S^2 -...
around the singularity s=0.
- coff — resolvent (cofactor method)