Hi Yuhui,
I asked a similar question some years ago here:
http://lemma-one.com/pipermail/proofpower_lemma-one.com/2004-September/000235.html
See the replies for an explanation of the issue, in particular Roger's
emails.
In your case, you need to specialize the theorem z_id_%bij%_thm before
adding/stripping into the assumtions, e.g.
a (strip_asm_tac (z_%forall%_elim %SZT% y %% z_id_%bij%_thm));
Phil
28/05/15 17:18, YuHui Lin wrote:
Dear all,
I get the following error when I tried to instantiated a forall quantifier in
an assumption which I inserted using asm_tac.
Exception Fail * Trying to instantiate type variable 'a, which occurs in
assumption list [z_∀_elim.6006] * raised
The following dummy example can replay this error
set_goal ([], %SZT% %forall% x : %int%; y : %pset% %int% %=% x %mem% y %or% x
%notmem% y %%);
a (strip_tac);a (strip_tac);a (strip_tac);
a (asm_tac z_id_%bij%_thm);
a (z_spec_nth_asm_tac 1 %SZT% y %%);
What does this error mean ? Where did I do wrong here ? Thanks in advance.
best,
Yuhui
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