Perl 6 - the future is here, just unevenly distributed

IRC log for #isabelle, 2017-01-17

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Time Nick Message
02:48 ilbot3 joined #isabelle
02:48 Topic for #isabelle is now Official channel for the Isabelle/HOL theorem prover: http://www.cl.cam.ac.uk/research/hvg/Isabelle/index.html || Now with logging: http://irclog.perlgeek.de/isabelle/
04:39 AtnNn Is there a shorter way of writing `show "EX x . P(x)" proof show "P(w)" by rule qed'?
06:53 ThreeOfEight AtnNn: "by (rule exI[of _ w])"
06:54 ThreeOfEight or "have "P w" by (whatever)" and then "thus "∃x. P x" .."
06:54 ThreeOfEight where ".." is an abbreviation for "by rule"
08:49 JCaesar And where by rule will pick the default rule, which is exI in that case… (right? How does that work, btw?)
10:28 silver joined #isabelle
11:05 ThreeOfEight JCaesar: I think it just non-deterministically picks a matching rule that was declared intro, intro!, or intro?
11:08 ThreeOfEight also elim, apparently
11:10 ThreeOfEight there's a structure called "claset" where rules like this are stored
11:10 ThreeOfEight see ~~/src/Provers/classical.ML
11:36 silver joined #isabelle
14:44 ammbauer joined #isabelle
15:05 ammbauer joined #isabelle
16:42 AtnNn Thanks

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