By B. I. Plotkin

The e-book is dedicated to the research of algebraic constitution. The emphasis is at the algebraic nature of genuine automation, which seems to be as a usual three-sorted algebraic constitution, that enables for a wealthy algebraic conception. in keeping with a normal classification 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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**Example text**

In this case the quotient automaton 9/p= ( A / p i > T / p 2 > B / p 3 ) a l s o be a semigroup automaton. Example. Let 9=(A, r , B ) be a semigroup automaton, (A o ,r,B Q ) T-subautomaton i n 3, p^ an equivalence on the set A, classes o f which are the set A and i n d i v i d u a l elements not belonging t o A ; p o 0 3 is a s i m i l a r equivalence on the set B. Let P 2 =P E be a t r i v i a l equivalence on the set T, i . e . the equivalence, whose classes coincide w i t h the e l e ments o f T.

Let x 1 when 2 a *y=a *y when f o r a l l aeA h o l d a o y ^ a o ^ and be the equivalence on the set A d e f i n e d by: a x a , A * 1 A 2 f o r a l l yer. Thus, input elements 1 2 y and y 1 are 2 X p - e q u i v a l e n t , i f they act i d e n t i c a l l y as operators on the set o f s t a t e s A and from A t o B; s t a t e s a and a are x - e q u i v a l e n t , i f a and a act l ? A 1 2 i d e n t i c a l l y as f u n c t i o n s from the input set T t o the output s i g n a l set B. The automaton (A,r,B) i s exact, i f classes o f the congruence x c o n s i s t o f the separate elements, i .

This d e f i n i t i o n i s correct, Suppose that i n t h e form (a, b r =(acr, aip) i . 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