Resumen de Representing matrices, M-ideals and tensor products of L₁-predual spaces

S. Dutta, D. Khurana, A. Sensarma

• Motivated by Bratteli diagrams of Approximately Finite Dimensional (AF) C-algebras, we consider diagrammatic representations of separable L1-predual spaces and show that, in analogy to a result in AF C-algebra theory, in such spaces, every M-ideal corresponds to directed sub diagram. This allows one, given a representing matrix of a L1-predual space, to recover a representing matrix of an M-ideal in X. We give examples where the converse is true in the sense that given an M-ideal in a L1-predual space X, there exists a diagrammatic representation of X such that the M-ideal is given by a directed sub diagram and an algorithmic way to recover a representing matrix of M-ideals in these spaces. Given representing matrices of two L1-predual spaces we construct a representing matrix of their injective tensor product.