Proof Analysis

This book continues from where the authors'' previous book Structural Proof Theory ended. It presents an extension of the methods of analysis of proofs in pure logic to elementary axiomatic systems and to what is known as philosophical logic. A self-contained brief introduction to the proof theory of pure logic is included that serves both the mathematically and philosophically oriented reader. The method is built up gradually with examples drawn from theories of order lattice theory and elementary geometry. The aim is in each of the examples to help the reader grasp the combinatorial behaviour of an axiom system which typically leads to decidability results. The last part presents as an application and extension of all that precedes it a proof-theoretical approach to the Kripke semantics of modal and related logics with a great number of new results providing essential reading for mathematical and philosophical logicians.