Diagramas para o Antilogismo de Ladd

Christine Ladd (aka Christine Ladd-Franklin) proposed in 1881 a treatment of the Categorical Syllogistics, known as “Antilogism,” which consists in the test of inconsistency of the triad of categorical propositions constituted by the premises and the negation of the conclusion of a Syllogism. The advantage of this treatment is to use a single valid form, if the Antilogism is algebraically expressed. I use ideas incorporated to diagrammatic methods that I developed for Categorical Syllogistics – the Method of Gardner and the Method of Gardner-Peirce – to provide a graphical expression to Ladd's Antilogism.