ABSTRACT
A relation is said to be serial, or to generate a series, when it possesses three different properties, namely (1) being contained in diversity, (2) transitiveness, (3) connexity, i.e. the property that the relation or its converse holds between any two different members of its field. Thus P is a serial relation if
(1) P J, (2) P2 P, (3) x, y C′P x ≠ y x, y: xPy v yPx.
