[isabelle-dev] type class ordered_semiring_1

[Florian Haftmann]

> But I have big doubts about this:
> 
> class partial_abs_if = minus + uminus + ord + zero + abs +
> 
> Thoughts?

Looks slightly special indeed.

I would recommend to proceed iteratively and to leave doubtful classes 
where they currently are.

	Florian

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