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

[Florian Haftmann]

> A more drastic solution would be to just get rid of the "number" class
> altogether (its sole purpose seems to be so that you can have types
> where numerals have a non-standard meaning) and have a single
> definition of number_of that works uniformly for all types.

This would indeed be helpful, but I guess the natural numbers are the
show stopper.

Of course we could also attempt to get rid of signed numerals ;-)

	Florian

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