Thank you to all of you! On Sep 15, 12:59 pm, Simon King <simon.k...@uni-jena.de> wrote: > PS: > > > sage: cm.explain(QQ, b.parent()) > > I forgot to copy-and-paste the definition of "cm". It was: > > sage: from sage.structure.element import get_coercion_model > sage: cm = get_coercion_model() > > Cheers, > Simon
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