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### Single Idea 12828

#### [catalogued under 4. Formal Logic / G. Formal Mereology / 2. Terminology of Mereology]

Full Idea

The 'general sum' of all objects satisfying a certain predicate is denoted by a variable-binding operator, expressed by 'σx(Fx)', read as 'the sum of objects satisfying F'.

Gist of Idea

General sum: the sum of objects satisfying some predicate, written σx(Fx)

Source

Peter Simons (Parts [1987], 1.1.08)

Book Reference

Simons,Peter: 'Parts: a Study in Ontology' [OUP 1987], p.15

A Reaction

This, it seems, is introduced to restrict some infinite classes which aspire to be sums.