Single Idea 14105

[catalogued under 5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / b. Basic connectives]

Full Idea

The number of logical constants is not great: it appears, in fact, to be eight or nine.

Gist of Idea

There seem to be eight or nine logical constants

Source

Bertrand Russell (The Principles of Mathematics [1903], §012)

Book Reference

Russell,Bertrand: 'Principles of Mathematics' [Routledge 1992], p.11


A Reaction

There is, of course, lots of scope for interdefinability. No one is going to disagree greatly with his claim, so it is an interesting fact, which invites some sort of (non-platonic) explanation.