Toshharu Waragai

This paper treats the logical character and content of the weak form of the law of extensionality which I named WΩ (weak omega) and the role it plays in the so-called successive simplification of the sole axiom of Les̈niewski's Ontology. In doing so, the present author defined singular sentences of the form 'aεb' by appealing to the idea we find in Leibniz and Garlandus Compotista. © 2021 Elsevier B.V., All rights reserved.