If you’ve ever wondered, “What is the absolute minimum logic needed to build an ITP?” – isabelle-extreme is your answer.
isabelle extreme This opens a theory file with the extension .ext . Here’s a minimal example: isabelle-extreme
Also known as (EXperimental TRansformational Equational Mathematics Engine), this is not a new front-end or library. It is a radically stripped-down meta-logic – the absolute minimal core needed to perform interactive proofs within the Isabelle framework. If you’ve ever wondered, “What is the absolute