Have you experimented with minimal logics inside Isabelle? Share your experiences below!
(* Prove a simple property manually – no automation! ) lemma add_zero: "add 0 m = m" unfolding add_def by (rule fix_eq) ( primitive rule only *) isabelle-extreme
Beyond the Mainland: Exploring isabelle-extreme , the Minimalist Core of Interactive Theorem Proving Have you experimented with minimal logics inside Isabelle