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Re: [Coq-Club] "Sequence is associative." (?)

From: Théo Zimmermann <theo.zimmi AT gmail.com>
To: Coq Club <coq-club AT inria.fr>
Subject: Re: [Coq-Club] "Sequence is associative." (?)
Date: Wed, 23 Jan 2019 11:18:20 +0100
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Le mer. 23 janv. 2019 à 10:33, Jeremy Dawson <Jeremy.Dawson AT anu.edu.au> a écrit :

Hi,

thanks for all the answers to my previous questions, some of which I'm
still working through.

In https://coq.inria.fr/refman/proof-engine/ltac.html
under Semantics then under Sequence it says
Sequence is associative.

I would take that to mean that
(tac1 ; tac2) ; tac3
is the same as
tac1 ; (tac2 ; tac3)

But is this so? What if the tactics do some instantiating of
existential variables, then the order of attacking subgoals would matter?

The order would be the same in both cases.

Also, for the same reason, it would be useful to know, for
tac1 ; tac2
which order tac2 is applied to the subgoals resulting from tac1

This can depend on tactic, but in practice it would be in the listed order of the goals for virtually all tactics.

Cheers,

Jeremy

[Coq-Club] "Sequence is associative." (?), Jeremy Dawson, 01/23/2019
- Re: [Coq-Club] "Sequence is associative." (?), Théo Zimmermann, 01/23/2019
  - Re: [Coq-Club] "Sequence is associative." (?), Cao Qinxiang, 01/23/2019
    - Re: [Coq-Club] "Sequence is associative." (?), Théo Zimmermann, 01/23/2019
      - Re: [Coq-Club] "Sequence is associative." (?), Théo Zimmermann, 01/23/2019
        
        Re: [Coq-Club] "Sequence is associative." (?), Jeremy Dawson, 01/23/2019
  - Re: [Coq-Club] "Sequence is associative." (?), Jean-Christophe Léchenet, 01/23/2019
    - Re: [Coq-Club] "Sequence is associative." (?), Théo Zimmermann, 01/23/2019
      - Re: [Coq-Club] "Sequence is associative." (?), Théo Zimmermann, 01/23/2019
        
        Re: [Coq-Club] "Sequence is associative." (?), Jeremy Dawson, 01/24/2019
        
        Re: [Coq-Club] "Sequence is associative." (?), Jeremy Dawson, 01/24/2019
  - Re: [Coq-Club] "Sequence is associative." (?), Jeremy Dawson, 01/28/2019