[isabelle-dev] Default simprules for division in fields

[Florian Haftmann]

> lemma divide_minus_left [simp]: "(-a) / b = - (a / b)"
> lemma divide_minus_right [simp]: "a / - b = - (a / b)”
> 
> It would be a mistake to reorient the simprules, but I am suggesting that they should not be declared as simprules with either orientation.

Maybe
> lemma divide_minus_left [field_simps]: "(-a) / b = - (a / b)"
> lemma divide_minus_right [field_simps]: "a / - b = - (a / b)”
instead?

	Florian

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