A generic theorem prover with support for several object-logics, developed by Lawrence C. Paulson Larry.Paulson@cl.cam.ac.uk
in collaboration with Tobias Nipkow (http://in.tum.de/~nipkow/) at the Technical University of Munich.
A system of type classes allows polymorphic
object-logics with overloading
and automatic type inference
Isabelle supports first-order logic
and classical versions; higher-order logic, similar to Gordon's HOL
; Zermelo Fränkel set theory
; an extensional
version of Martin Löf's type theory, the classical first-order sequent calculus, LK
; the modal logics T
, S4, and S43; and Logic for Computable Functions
An object logic's syntax
and inference rules are specified declaratively
allowing single-step proof construction. Proof procedures can be expressed using "tactics" and "tacticals". Isabelle provides control structures for expressing search procedures and generic tools such as simplifiers and classical theorem provers which can be applied to object-logics. Isabelle is built on top of Standard ML
and uses its user interface.
Mailing list: email@example.com.