expr3 = collect( expr2, M**(n+1), exact=True )
This doesn't work because it is M(2, 1)**(n+1) that is present in expr2,
and not M**(n+1). So you must use:
expr3 = collect( expr2, M(2, 1)**(n+1), exact=True)
Ųyvind
Thank you very much for your response, Ųyvind! That works well for me,
so once again, thank you!
Nicholas
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