  In the Posterior Analytics i.4, Aristotle also develops three notions crucial to his theory of scientific claims: ‘of every’, ‘per se’ (kath’ hauto) or ‘in virtue of itself’ (in four ways) and ‘universally’ (katholou). Although his exposition of these notions is tailored to his proof theory, the notions are designed also to characterize the basic features of any scientific claim, where the principal examples come mostly from mathematics. (See §6 Demonstrations and Demonstrative Sciences of the entry on  Aristotle's logic.)