For some years, specification of software and hardware

systems has been influenced not only by algebraic methods

but also by new developments in logic. These new

developments in logic are partly based on the use of

algorithmic techniques in deduction and proving methods, but

are alsodue to new theoretical advances, to a great extent

stimulated by computer science, which have led to new types

of logic and new logical calculi. The new techniques,

methods and tools from logic, combined with algebra-based

ones, offer very powerful and useful tools for the computer

scientist, which may soon become practical for commercial

use, where, in particular, more powerful specification tools

are needed for concurrent and distributed systems.

This volume contains papers based on lectures by leading

researchers which were originally given at an international

summer school held in Marktoberdorf in 1991. The papers aim

to give a foundation for combining logic and algebra for the

purposes of specification under the aspects of automated

deduction, proving techniques, concurrency and logic,

abstract data types and operational semantics, and

constructive methods.