Out of curiosity:

How would one do the instantiation that Magnus doesn't need i.e.
instantiate using (and under) and existential?

On Tue, Mar 22, 2016 at 4:12 AM, Ramana Kumar <ramana.ku...@cl.cam.ac.uk>
wrote:

> Yes there is:
> CONV_TAC(RESORT_EXISTS_CONV(sort_vars["y"])) \\ qexists_tac`5`
>
> On 22 March 2016 at 07:08, Magnus Myreen <mo...@cam.ac.uk> wrote:
>
>> Hi hol-info,
>>
>> Quick question: is there a tactic for instantiating a nested
>> existential based on a name? Example: for a goal such as
>>
>>   ?x y z. ... y ...
>>
>> I want to use a tactic foo_tac `y` `5` and get:
>>
>>   ?x z. ... 5 ...
>>
>> Is there such a foo_tac tactic? I suspect this functionality is there
>> somewhere already. If not, then I'll implement it.
>>
>> Note: I don't need the advanced feature of being able to instantiate
>> it with `x+z+1` where the variables refer to the other existentially
>> quantified variables.
>>
>> Many thanks,
>> Magnus
>>
>>
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>
>
>
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