Provability logics and related algebras (e.g., diagonalizable algebras), First-order arithmetic and fragments, Reference, unification, proof term, Proof theory, Single conclusion logic of proofs, admissible inference rule, proof theory, provability semantics, reference, Theoretical Computer Science, Admissible inference rule, Mechanization of proofs and logical operations, Unification, Proof term, explicit modal logic, single conclusion logic of proofs, Explicit modal logic, Computer Science(all)