Full Idea
There are topics of great philosophical interest that classical logic neglects because they are not important to mathematics. …These include distinctions of past, present and future, or of necessary, actual and possible.
Gist of Idea
Classical logic neglects the non-mathematical, such as temporality or modality
Source
John P. Burgess (Philosophical Logic [2009], 1.1)
Book Reference
Burgess,John P.: 'Philosophical Logic' [Princeton 2009], p.1