*To*: cl-isabelle-users at lists.cam.ac.uk*Subject*: Re: [isabelle] Infinitely recursive lambda expression or not?*From*: Yannick Duchêne (Hibou57) <yannick_duchene at yahoo.fr>*Date*: Fri, 27 Dec 2013 18:47:59 +0100*Organization*: Ada @ Home*References*: <op.w72usxweule2fv@cardamome> <C743CBFE-029F-4E49-9A56-3695338394B8@cantab.net> <52AC4D87.9030304@gmx.com> <op.w723lrn9ule2fv@cardamome> <52B227C7.6070607@gmx.com> <op.w8p2ilo1ule2fv@cardamome> <op.w8rgogrkule2fv@cardamome> <2D976E64-08BA-4145-ACC3-588AFC48DF66@cam.ac.uk>*User-agent*: Opera Mail/12.16 (Linux)

From a computational point of view, "f a = (a ∨ f a)” must be regardedas undefined, because the recursion is not well-founded. There arelogics where you could then prove that f(True)=True andf(False)=undefined.Larry Paulson

-- “Syntactic sugar causes cancer of the semi-colons.” [1] “Structured Programming supports the law of the excluded muddle.” [1] [1]: Epigrams on Programming — Alan J. — P. Yale University

**Follow-Ups**:**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Lawrence Paulson

**References**:**[isabelle] Infinitely recursive lambda expression or not?***From:*Yannick Duchêne (Hibou57)

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*John Wickerson

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Gottfried Barrow

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Yannick Duchêne (Hibou57)

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Gottfried Barrow

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Yannick Duchêne (Hibou57)

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Yannick Duchêne (Hibou57)

**Re: [isabelle] Infinitely recursive lambda expression or not?***From:*Lawrence Paulson

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