Suppose that R is some parent which is contained in the category
Algebras(B) for some ring B, how does one determine B from the parent R?
I am asking because I want to implement a new method in the
ParentMethods of Algebras, which needs to refer to the base_ring of the
category. I feel like ParentMethods should have a way to refer back to
the category where the ParentMethods was defined.
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