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Hi -

when updating the "basics of diagonalization" article, meant for Ivars, I detected a problem, which may have consequences in the diagonalization-approach and the attempt to get fractional powers by matrix-logarithm and/or diagonalization. Or, with the fixpoint-shift - I can't estimate it.
It looks like a minor curiosity, but makes me think about the completeness of the matrix-instruments, which we apply.

See the last (short) chapter in Intro_in_Diagonalization.pdf

Gottfried