Equality, Symbol of, [189]–91.

Equations in Logic, [189]–91; their types, [191]–4;.expression of propositions as equations, [194].

Equipollent Propositions, [117].

Equivalent Propositions, [117]; tables of equivalent propositions, [141]; [146]; [208]; [481].

Equivalent Terms, Table of, [476].

Equivocal Term, [65].

Essential Proposition, [50].

Etymology and Connotation, [28].

Euclid, [136]; [420]; [430].

Euler’s diagrams, five-fold scheme, [157]–62; seven-fold scheme, [170]–4; their application to the 542 quantification of the predicate, [200]–4; to syllogistic reasonings, [288], [341]–4.