Read e-book online Algebraic Structures in Automata and Database Theory PDF

By B. I. Plotkin

ISBN-10: 9810209363

ISBN-13: 9789810209360

The e-book is dedicated to the research of algebraic constitution. The emphasis is at the algebraic nature of genuine automation, which seems as a traditional three-sorted algebraic constitution, that permits for a wealthy algebraic concept. in keeping with a normal class place, fuzzy and stochastic automata are outlined. the ultimate bankruptcy is dedicated to a database automata version. Database is outlined as an algebraic constitution and this permits us to contemplate theoretical difficulties of databases.

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Extra info for Algebraic Structures in Automata and Database Theory

Example text

E . i t does n o t depend on t h e manner o f the r e p r e s e n t a t i o n o f the element (a,b) i n t h e form l e t (a,b) = (a

P^ maps itself, are homomorphisms t h e automaton i s an endomor- and u ^ u ^ i s i t s canonical and not endomorphisms. (A,T,B) into the automaton These automata have common basic s e t s , b u t d i f f e r e n t ope- 20 An important r o l e i n the theory o f automata can p l a y t h e n o t i o n of a homomorphism with substitution. 4) (a "1 "2 P 3 »x ) =a*x ; aeA, xeX. ( I n the given example the mapping acts i n the opposite d i r e c t i o n i n comparison w i t h p. and p^j. The homomorphism w i t h t h e s u b s t i t u t i o n o f the output s i g n a l can be n a t u r a l l y explained: i n p u t s i g n a l s o f t h e automaton 9 are coded by t h e s i g n a l s o f the automaton 9 ' and o p e r a t i o n o f the second automaton i m i t a t e s the o p e r a t i o n o f t h e f i r s t one and decoding i s performed i n the output.

Let t h i s represen- t a t i o n be a r b i t r a r i l y extended t o the automaton (A,T,B). This automaton cannot be exact. Indeed, l e t f:T —> S(A,B) be the mapping o f T t o S(A, B) d e f i n e d by t h i s automaton, and y^=(i>,tp). As aoy=a, then y* = (e,(p), where e i s an i d e n t i c a l t r a n s f o r m a t i o n o f the set A. Since (e, ip) (e, 0) = (e, iji), then the image right o f the semigroup T i n S(A,B) i s a semigroup o f the zeros. But by the c o n d i t i o n T i s not a semigroup o f the r i g h t zeros.

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Algebraic Structures in Automata and Database Theory by B. I. Plotkin

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