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. Albert also authored commentaries on Ars Vetus, a set of twenty-five Quaestiones logicales (c. 1356) that involved semantical problems and the status of logic, and Quaestiones on the Posterior Analytics. Albert explored in a series of disputed questions the status of logic and semantics, as well as the theory of reference and truth. Albert was influenced by English logicians and was influential in the diffusion of terminist logic in central Europe. Albert is considered a major contributor in his theory of consequences, found in his Perutilis Logica. Albert took a major step forward in the medieval theory of logical deduction. But it was his commentary on Aristotle's Physics that was especially widely read. Many manuscripts of it can be found in France and Italy, in Erfurt and Prague. Albert's Physics basically guaranteed the transmission of the Parisian tradition to Italy, where it was authoritative along with the works of Heytesbury and John Dumbleton. His commentary on Aristotle's De caelo was also influential, eventually eclipsing Buridan's commentary on this text. Blasius of Parma read it in Bologna between 1379 and 1382. A little later, it enjoyed a wide audience at Vienna. His Treatise on Proportions was often quoted in Italy where, in addition to the texts of Thomas Bradwardine and Oresme, it influenced the application of the theory of proportions to motion. Albert's commentaries on the Nicomachean Ethics and the Economics also survive (both unedited), as well as several short mathematical texts, most notably Tractatus proportionum (c. 1353). Although Albert studied theology in Paris, no theological writing survived.