21

18

there is not, if negative numbers are included.

Thus, the Arithmetic of Ordinal Numbers is
Pure Mathematics; but the Arithmetic of Cardinal
Numbers is Applied Mathematics. The conception
of a Collection is, therefore, not a mathematical
conception and the conception of Multitude is not a
purely mathematical conception. But the conception
of a collection is a highly important logical conception
and for that reason, we will turn our attention to Multitude.

But why should the conception of Multitude be
an important conception in logic? I will tell you. We
have seen that there are three relations which subsist
between the parts of graphs. The first is the relation
expressed by the scroll [diagram]. This is the most important
of all, since this is the relation of premiss