[isabelle-dev] NEWS: 'subgoal' command

Lars Noschinski noschinl at in.tum.de
Fri Jul 3 07:54:08 CEST 2015

On 03.07.2015 04:02, Daniel Matichuk wrote:
> Additionally, fresh names are chosen for any free variables that appear in the subgoal
> e.g.
> lemma "⋀x y. A x y"
>   subgoal for A
> Results in "x" being named "Aa". In this case I would expect either an error ("Free name clash") or for the new fixed term to shadow the free A.
> The second choice is a bit strange, however, because you end up with two different coloured "A"s in the goal.

I would expect unspecified variables to get internal names, i.e. names
ending with "_"; similar to variables not specified in a case command.

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