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By an "aggregate" (Menge) we are to understand any collection into a whole (Zusammenfassung zu einem Ganzen) $$M$$ of definite and separate objects $$m$$ of our intuition or our thought. These objects are called the "elements" of $$M$$.

In signs we express this thus: (1) We denote the uniting of many aggregates $$M$$, $$N$$, $$P$$, $$...$$, which have no common elements, into a single aggregate by (2) 85