Intensio: Leibniz in Creating a New Term for the Modal Logic

Abstract

Leibniz’s achievements and intuitions in the field of intensional logics were evaluated, for the first time, by no other than the creator of the modern modal logic Clarence I. Lewis, whose seminal 1918 monograph contains a very important historical essay on Leibniz with addition of two translations of his pertinent works (published for the first time in 1903, but not acknowledged as important even then).