Sextus Empiricus Pyrrhoniae Hypotyposes 3.12.91

1. i.e. the Dogmatists, who assumed the indivisibility of the ‟one.” In the next sections (92–93) it is shown that ‟a part cannot be subtracted from a part,” i.e., in the case of the ‟Decad,” you cannot subtract 1 from 9: for 10–1 still leaves an ‟entire” 9; and if 9 = 9 x 1, and 1 is subtracted from each of the 9 ones, the subtracted 1 will be 1 x 9; and the same applies to subtraction of 1 from other ‟parts” of the ‟Decad” (8, 7, 6, etc.), of which the last is 1, which, as indivisible, does not admit of subtraction.