Re: [isabelle] undefined & None



> That
> incident has become one of the many Isabelle in-jokes, until it was
> replaced by this formal one by Florian Haftmann around 2005:
> 
>   if arbitrary = undefined then SOME x. True else SOME x. False

AFAIR this (and similar formulations) is due to Alex Krauss.

	Florian

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