System S4F

[Hughes and Cresswell, 1996]


This is often a temporal system, with La meaning "'a' is and always will be".

As a temporal system, it assumes that time ends.

Based on

The system S4F is S4 + the axiom F [(LMp & LMq) > M(p&q)] [Hughes and Cresswell, 1996]

Basis for

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