more from M Fitting/R Mendelsohn

### Single Idea 9734

#### [catalogued under 4. Formal Logic / D. Modal Logic ML / 2. Tools of Modal Logic / b. Terminology of ML]

Full Idea

Modern modal logic takes into consideration the way the modal relates the possible worlds, called the 'accessibility' relation. .. We let R be the accessibility relation, and xRy reads as 'y is accessible from x.

Clarification

[R is usually printed in a script font]

Gist of Idea

Modern modal logic introduces 'accessibility', saying xRy means 'y is accessible from x'

Source

M Fitting/R Mendelsohn (First-Order Modal Logic [1998], 1.5)

Book Reference

Fitting,M/Mendelsohn,R: 'First-Order Modal Logic' [Synthese 1998], p.9

A Reaction

There are various types of accessibility, and these define the various modal logics.