2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59949Let X be an L_1-predual space and let K be a countable linearly independent subset of the extreme points of its closed dual ball. It is shown that if the norm-closed linear span Y of K is w^*-closed in X^*, then Y is the range of a w^*-continuous contractive projection in X^*. This result is applied in order to provide new and simpler proofs of the results of Lazar, Lindenstrauss and Zippin on the embedding of C(K) spaces into X.13 pages, AMS-LaTeXFunctional Analysis46B25; 46B04text