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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