William Ockham (1285–1347/1349)
Tractatus logicae, Paris 1488
paper, paper binding; 280×196 mm, Olomouc Archbishopric – Archdiocesan Museum in Kroměříž, 21356, A2 II/4 25
In accordance with scholastic traditions, Ockham placed a high value on logic. His Summa logicae – in this case Tractatus logicae – is a very original work. It consists of three parts, the first dealing with notions and meanings, the second dealing with propositions and the third with arguments, syllogisms, paradoxes and falsehood.