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Single Idea 18107

[from 'Philosophy of Mathematics' by David Bostock, in 4. Formal Logic / F. Set Theory ST / 3. Types of Set / a. Types of set ]

Full Idea

A 'proper class' cannot be a member of anything, neither of a set nor of another proper class.

Gist of Idea

A 'proper class' cannot be a member of anything

Source

David Bostock (Philosophy of Mathematics [2009], 5.4)

Book Reference

Bostock,David: 'Philosophy of Mathematics: An Introduction' [Wiley-Blackwell 2009], p.151

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