2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67437A II_1 factor embeds into the ultraproduct of the hyperfinite II_1 factor if and only if it satisfies the W*-analogue of Lance's weak expectation property. This note gives a self contained proof of this fact.7 pagesOperator Algebras46L05text