Is there a way to print theorems with types displayed?
> On Jul 23, 2018, at 12:20 PM, Thomas Tuerk <tho...@tuerk-brechen.de> wrote:
>
> Hi,
>
> hard to say, why it does not work without further details. However, one guess
> is that types do not match. I would recommend showing the types when printing
> the theorem. I expect that P might be of type `'a -> bool`. In this case you
> need to instantiate 'a to string first.
>
> Best
>
> Thomas
>
> On 23.07.2018 18:10, Dylan Melville wrote:
>> I have a theorem called EX which returns true when a value is an element of
>> a list. It is defined as:
>>
>> thm = |- (EX P [] <=> F) /\ (EX P (CONS h t) <=> P h \/ EX P t)
>>
>> I am trying to use this theorem with `P` being `(\x. x = “T”)` and `t` being
>> a long list of strings which contains “T”. Unfortunately my attempts to use
>> INST on this theorem haven’t worked. Why doesn’t the following work?
>>
>> INST [`(\x:string. x = “T")`,`P:(string->bool)`] EX;;
>>
>> Thank you.
>>
>> -Dylan Melville (McMaster University)
>>
>>
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