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

Lawrence Paulson lp15 at cam.ac.uk
Wed Jun 22 21:21:30 CEST 2011

As I recall, the number class is for all types where numerals have a meaning. Of course, it is a constituent of number_ring, to which many numeric types belong, but not the naturals.

On 22 Jun 2011, at 19:55, Florian Haftmann wrote:

>> 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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