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Single Idea 18396

[from 'Truth and Truthmakers' by David M. Armstrong, in 4. Formal Logic / F. Set Theory ST / 1. Set Theory ]

Full Idea

The idea is that braces { } attribute to an entity the place-holding, or perhaps determinable, property of unithood.

Gist of Idea

The set theory brackets { } assert that the member is a unit

Source

David M. Armstrong (Truth and Truthmakers [2004], 09.5)

Book Reference

Armstrong,D.M.: 'Truth and Truthmakers' [CUP 2004], p.122

A Reaction

I like this. There is Socrates himself, then there is my concept , and then there is the singleton {Socrates}. Those braces must add something to the concept. You can't add braces to Socrates himself.

Related Idea

Idea 18392 Classes have cardinalities, so their members must all be treated as units [Armstrong]