De universaliori calculi idea, cum annexo specimine
Year of Conception: ?
Year of Writing: April 1767
Year of Publication: 1764 (zurückdatiert!)
Publication: De universaliori calculi idea, cum annexo specimine. Nova Acta Eruditorum, Annum 1764/1765, 441-473.(7)
Lambert describes his calculus of lines and letters to compute the truth of syllogisms. This kind of calculus was rather popular around the time, Holland and Plouquet also published own variants of such systems. Lambert himself developed five more that were published posthumously in the Logische und Philosophische Abhandlungen (1782).