Full Idea
Arithmeticians posit that a unit is what is quantitatively indivisible.
Gist of Idea
A unit is what is quantitatively indivisible
Source
Aristotle (Posterior Analytics [c.327 BCE], 72a22)
Book Reference
Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.4
A Reaction
Presumably indeterminate stuff like water is non-quantitatively divisible (e.g. Moses divides the Red Sea), as are general abstracta (curved shapes from rectilinear ones). Does 'quantitative' presupposes units, making the idea circular?