 The title of creator of the theory of relations was reserved for C. S. Peirce. In several papers published between 1870 and 1882a, he introduced and made precise all the fundamental concepts of the theory of relations and formulated and established its fundamental laws.…In particular, his investigations made it clear that a large part of the theory of relations can be presented as a calculus which is formally much like the calculus of classes developed by G. Boole and W. S. Jevons, but which greatly exceeds it in richness of expression and is therefore incomparably more interesting from the deductive point of view. (Tarski 1941: 73)