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A proof assistant is software used for creating and checking formal proofs; examples include Coq and HOL. This tag is not to be used for requesting assistance on finding proofs. General questions about proof assistants can also be asked on the Proof Assistants Stack Exchange site.
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Is there any proof assistant based on first-order logic?
I'm looking for a proof assistant in order to write formal proofs about basic facts of set theory, such as:
$a\subseteq a$
$(a,b)=(c,d)\leftrightarrow a=c\land b=d$
Natural deduction for first-ord …