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Single Idea 13711

[filed under theme 4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / f. System B ]

Full Idea

With system B we begin to be able to say something about iterated modalities. ..S4 then takes a different stand on the iterated modalities, and neither is an extension of the other.

Gist of Idea

System B introduces iterated modalities

Source

Theodore Sider (Logic for Philosophy [2010], 6.4.4)

Book Ref

Sider,Theodore: 'Logic for Philosophy' [OUP 2010], p.168

Related Idea

Idea 13704 It is hard to say which are the logical truths in modal logic, especially for iterated modal operators [Sider]