Hi,
In Sage 8.1.beta8 and all previous versions (at least down to 7.5.1), we
have
sage: s = function('f')(x) * x^2
sage: s.coefficients(x) # OK
[[f(x), 2]]
sage: s = diff(function('f')(x), x) * x^2
sage: s.coefficients(x) # Bam!
Erreur de segmentation (core dumped)
Is this a known bug?
Eric.
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