I would like to experiment with adding some new types. One of the is SemiRing (this is an algebraic structure which is like a ring except that there might not be an additive inverse -- think of the nonnegative integers). I would like to insert it in the class hierarchy so that every Ring is a SemiRing. Would the best way to to change ring.pyx in sage.rings, or is there something extra that I need to do with categories?
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