Un Algorithme Calculant le Cardinal, Fini ou Infini, des Demi-Groupes de Matrices

Abstract Let S be a finite set of matrices over a commutative field K . We give here an algorithm which decides whether the matrix semigroup H generated by S is finite; and in that case, our algorithm computes the cardinality of H . In other words, we can decide by an effective procedure whether a K -automaton is a finite automaton.