Eduction& types of Eductions. [Conversion, Obversion, Obverted Converse, Contrapositive (Partial and Full), Inverse (Partial and Full)

Take one true sentence — ‘All flowers are attractive things’ — and, without adding a single new fact, you can generate five more true sentences from it just by rearranging its terms in fixed, rule-governed ways. That whole family of moves is called eduction, and it is the most mechanical, most drillable skill this paper tests: get the rules right, and you can do it to any A, E, I or O proposition you are ever given.

In two minutes

Eduction is the process of deriving a new proposition, equivalent or closely related in meaning, from a given one purely by rearranging its terms and adjusting quality — without adding any new information — and this syllabus names five such operations: conversion, obversion, obverted converse, contrapositive (partial and full), and inverse (partial and full).

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