De la forma general de la proposición al problema Frege-Geach en el <i>Tractatus</i>

This paper develops the idea that, according to Wittgenstein’s Tractatus, assertion is an aspect of the very form of propositions that could be represented by means of a pro-sentence. Then, given the assertive character inherent to propositions, a new formulation of the Frege-Geach problem is suggested. Drawing on a distinction between token-propositions and type-propositions, as well as on the conception of logical constants as operations, I ultimately present a possible Tractarian solution to this version of the Frege-Geach problem.