[isabelle-dev] [isabelle] power2_sum outside of rings

[Florian Haftmann]

> I think it might be useful to do to class "number"
> what we did with class "power" a while back: Replace the overloaded
> constant with a single, standard definition.

This would indeed be a valuable goal.

> In any case, I think such a major change would require a bit of
> planning, and probably won't happen for a while. But I think that
> adding a number_semiring class would be a step in the right direction,
> and it would be easy enough to make that change right now.

If this can be done, it should be done.

	Florian

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