Re: [isabelle] more beginner questions

1) Is there a datatype for characters in isabelle?  I would like
   to prove stuff about a real world grammar for a language of

Yes, char, in List.

2) This is really basic but giving me a headache.  How can I make
   an optional tuple?  I tried "('a, 'a) option"  but that didnt seem
   to work properly.

You are using Haskell syntax. Try "('a * 'a) option".


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