2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/218948For real factors the notions of the coupling constant and the index are introduced and investigated. The possible values of the index for type II$_1$ real factors are calculated, in a similar way as for the complex case.20 pagesOperator AlgebrasFunctional Analysis46L10; 46L35text