Thanks, I’m going to use: ALL_IDENTICAL t = ?x. !y. MEM y t ==> y = x > Il giorno 19 ott 2017, alle ore 22:57, Mario Castelán Castro > <marioxcc...@yandex.com> ha scritto: > > If you want to allow the empty list then: > > “∀x y. MEM x l ∧ MEM y l ⇒ x = y” > > or: > > “∃x. set l ⊆ x”. > > or: > > “∃x. MEM y l ⇒ y = x”. > > -- > Do not eat animals; respect them as you respect people. > https://duckduckgo.com/?q=how+to+(become+OR+eat)+vegan > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! > http://sdm.link/slashdot_______________________________________________ > hol-info mailing list > hol-info@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/hol-info
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