Albert's voluminous collection of Sophismata (c. 1359) examined various sentences that raise difficulties of interpretation due to the presence of syncategorematic terms such as quantifiers and certain prepositions, which, according to medieval logicians, do not have a proper and determinate signification but rather modify the signification of the other terms in the propositions in which they occur. In his Sophismata, he followed William Heytesbury. In his analysis of epistemic verbs or of infinity, Albert admitted that a proposition has its own signification, which is not that of its terms : just like a syncategorematic term, a proposition signifies a "mode of a thing". Albert made use of the idea of the distinguishable signification of the proposition in defining truth and in dealing with “ insolubles ” or paradoxes of self-reference. In this work he shows that since every proposition, by its very form, signifies that it is true, an insoluble proposition will turn out to be false because it will signify at once both that it is true and that it is false.