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Proof General is a generic interface for proof assistants based on the Emacs editor. It supports files for several proof assistants including Coq file (.v), an EasyCrypt file (.ec), or a PhoX file (.phx). Historically, other proof assistants such as Isabelle.

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Why is Isabelle usually not just Isabelle but Isabelle/<xyz>?

Isabelle the program is designed as a "generic" LCF-style proof assistant/logical framework; it gives you a very minimal base logic (based on Church's simple type theory (pdf) and called Isabelle/Pure …
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