Associatividade nos produtos tensoriais projetivo e injetivo

Abstract

Given the normed spaces X_1,...,X_n, real or complex, in this work we study some properties of the projective tensor product of X_1,...,X_n and of the injective tensor product of X_1,...,X_n. The main purposes are to state and to provide detailed proofs of the following results: (i) The projective tensor product is associative; (ii) If at least two of the normed spaces X_1,...,X_n are infinite dimensional, then the tensor product of X_1,...,X_n endowed with the projective norm is incomplete; (iii) The injective tensor product is associative. To prove these results, the algebraic tensor product is constructed, the projective and injective norms are studied and linearization theorems for each of these cases are proved.