By A. Salomaa, D. Wood, Arto Salomaa

This quantity gathers lectures by way of eight wonderful pioneers of automata thought, together with Turing Award winners. In each one contribution, the early advancements of automata conception are reminisced approximately and destiny instructions are recommended. even supposing a few of the contributions move into particularly fascinating technical info, lots of the e-book is on the market to a large viewers attracted to the growth of the age of desktops.

The e-book is a needs to for pros in theoretical computing device technology and comparable parts of arithmetic. for college students in those components it presents an incredibly deep view at first of the recent millennium.

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Fischer, "Economy of Descriptions by Automata, Grammars, and Formal Systems", 12th IEEE Symp. on Switching and Automata Theory: 188-191, 1971. [Po] Post, E. "Recursively Enumerable Sets of Positive Integers and Their Decision Problems", Bulletin AMS 50:284-316, 1944. 37 A U T O M A T A THEORY: ITS PAST A N D FUTURE JOHN HOPCROFT Cornell University Ithaca, NY 14853, USA This paper briefly reviews key advances in automata theory since 1960. It focuses on why certain lines of inquiry were followed, why others were not, and why some works were deemed more valuable to the discipline than others.

References [Go] Godel, K. "Uber formal unentscheidbare Satze der Principia Mathematica und verwandter Systeme", Monatsheft fiir Mathematik und Physik, 38:173-198, 1931. [Ha] Hartmanis, J. "On the importance of being n2-hard", Bulletin of the European Assoc, of Theoretical Computer Science, (EATCS), vol 37:117-127, Feb. 1989. E. Hopcroft, "Independence results in computer science", ACM SIGACT News, Vol 8, No. -Dec. 1976. E. D. Ullman. Introduction to Automata Theory, Languages, and Computation. Addison-Wesley, Reading, MA, 1979.

Thus an automaton generates an element of the basic semiring A ((£*)). Our model of an automaton will be defined in terms of a (possibly infinite) transition matrix. The semiring element generated by the transition of the automaton from one state i to another state i' in exactly k computation steps equals the (i,i')-entry in the k-th power of the transition matrix. Consider now the star of the transition matrix. Then the semiring element generated by the automaton, also called the behavior of the automaton, can be expressed by the entries (multiplied by the initial and final weights of the states) of the star of the transition matrix.

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