Results and Trends in Theoretical Computer Science

This volume is dedicated to Professor Arto Salomaa on the occasion of his 60th birthday. The 32 invited papers contained in the volume were presented at the festive colloquium, organized by Hermann Maurer at Graz, Austria, in June 1994; the contributing authors are well-known scientists with special relations to Professor Salomaa as friends, Ph.D. students, or co-authors. The volume reflects the broad spectrum of Professor Salomaa's research interests in theoretical computer science and mathematics with contributions particularly to automata theory, formal language theory, mathematical logic, computability, and cryptography. The appendix presents Professor Salomaa's curriculum vitae and lists the more than 300 papers and 9 books he published.

Autorentext
Hermann Maurer studierte Mathematik und Physik in Österreich, Informatik in Kanada. Er war einige Jahre in der Industrie tätig, aber ist nun seit mehr als 30 Jahren Universitätsprofessor für Informatik an Universitäten in Kanada, USA, Deutschland, Brasilien, Australien, Neuseeland und vor allem an der Technischen Universität Graz in Österreich. Er ist mit zahlreichen wissenschaftlichen Büchern und über 500 wissenschaftlichen Publikationen in seinem Bereich der Informatik aktiv tätig, ist aber auch seit vielen Jahren schriftstellerisch aktiv, oft unter einem Pseudonym.

Inhalt
Generalizing Cook's transformation to imperative stack programs.- A rewriting of Fife's theorem about overlap-free words.- Reconsidering the jeep problem or how to transport a birthday present to Salosauna.- Learning picture sets from examples.- Randomness as an invariant for number representations.- Cooperating grammars' systems: Power and parameters.- Parallel pattern generation with one-way communications.- Dynamic labeled 2-structures with variable domains.- Deciding the NTS property of context-free grammars.- Homomorphic representations by products of tree automata.- Identities and transductions.- Decomposition of infinite labeled 2-structures.- An iteration property of Lindenmayerian power series.- Comparing descriptional and computational complexity of infinite words.- On some open problems concerning the complexity of cellular arrays.- Power of controlled insertion and deletion.- From colonies to eco(grammar)systems.- On the multiplicity equivalence problem for context-free grammars.- On general solution of word equations.- On (left) partial shuffle.- Learning theoretical aspects is important but (Sometimes) dangerous.- Bisimulation, games, and logic.- Cryptographic protocols and voting.- Cryptographic protocols for auctions and bargaining.- On the size of components of cooperating grammar systems.- An elementary algorithmic problem from an advanced standpoint.- Event detection for ODES and nonrecursive hierarchies.- Rediscovering pushdown machines.- String matching algorithms and automata.- Classifying regular languages by their syntactic algebras.- On polynomial matrix equations XT=p(X) and X=p(X) Where all parameters are nonnegative.- Gram's equation A probabilistic proof.