This makes me realise that I may have been misunderstanding field_simps.
I've been using it as a replacement after ring_simps disappeared a while
ago. It always struck me as odd, since I'm nearly always in a word type,
which is a ring but not a field.
Is it just a coincidence that field_simps usually does what I want?
Cheers,
Thomas.
On 05/04/14 03:09, Tobias Nipkow wrote:
I set up field_simps to yield a decision procedure for field equality, provided
all denominators can be proved to be 0. Hence I am sceptical if adding new rules
to it is a good idea. Florian, can you give an example where previously
field_simps was too weak but with the two additional rules it works?
Tobias
On 04/04/2014 17:37, Lawrence Paulson wrote:
A very good idea, which reduces the impact of the change on existing proofs. I
am trying it out now.
Seeing no objections, I am quite likely to push this change later today.
Larry
On 4 Apr 2014, at 15:08, Florian Haftmann
<[email protected]> wrote:
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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