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RE: [Coq-Club] Problem with dependent match statement


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  • From: "Soegtrop, Michael" <michael.soegtrop AT intel.com>
  • To: "coq-club AT inria.fr" <coq-club AT inria.fr>
  • Subject: RE: [Coq-Club] Problem with dependent match statement
  • Date: Fri, 15 Sep 2017 10:05:02 +0000
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Dear Jeff,

I wonder what is the advantage of using a definition of Fin n which is
equivalent to False for n=0 in connection with Vectors which exist for n=0.
What bad things would happen if Fin 0 would be defined and equivalent to a
0-tuple of unit rather than something which doesn't exist at all? Is the fact
that Fin 0 -> False used for ex falso quod libet proofs in some places? Since
the 0 length constructor of vectors is trivial I don't see many applications
for this. So unless you really need ex falso quod libet proofs using Fin 0
somewhere, I have doubts that this is the most efficient (in terms of human
time to get things done) way of setting up things.

Best regards,

Michael

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