Definition:Necessity Operator/Also denoted as

Necessity Operator: Also denoted as

The necessity operator can also be seen in the form $\map {\mathrm L} P$:

$\map {\mathrm L} P : \iff \forall w: \map P w$

for some proposition $P$ dependent on some world $w$.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): modal logic
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): modal logic