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Re: [PVS-Help] Cardinality over strict subsets

Actually, Jerry, when you worked on that doubleton theory with me earlier in the year, one of the lemmas you came up with was:

  singleton_singleton: LEMMA
    FORALL S: singleton?(S) IMPLIES (EXISTS t: S = singleton(t))

One of the comments you made in the code was that you "wish this was in the prelude" :)


Jerry James wrote:
On Wed, Aug 13, 2008 at 5:11 PM, Sam Owre <owre@xxxxxxxxxxx> wrote:
I'm happy to add this to the prelude for the next release.
Are there others like this that you know of belong in the
prelude (or, if more specialized, in the finite_sets

I can't think of any off-hand, but I'll let you know if I come up with something. Thanks!