*To*: "isabelle-users at cl.cam.ac.uk" <isabelle-users at cl.cam.ac.uk>*Subject*: [isabelle] SOME-operator*From*: Roger H. <s57076 at hotmail.com>*Date*: Wed, 22 May 2013 20:51:33 +0200*Importance*: Normal

Hello, is this lemma true? lemma "Domain (SOME r. Domain r = {2,3}) = {2,3}" if yes, how can it be proved? Thank you!

**Follow-Ups**:**Re: [isabelle] SOME-operator***From:*Lars Noschinski

**Re: [isabelle] SOME-operator***From:*René Thiemann

**Re: [isabelle] SOME-operator***From:*Johannes Hölzl

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