Philosophy Lexicon of Arguments

Equivalence: Relation between sentences. It exists if both sides have the same truth value, so that they are both true or both false.
Author Item Excerpt Meta data

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Bisubjunktion / (biconditional) / Wessel: an operator that makes one formula out of two - equivalence: no Operator, but sentence which asserts the equivalence of two formulas - the formulas are not even in the equivalence but quoted: "Formula A" , equi "formula B"

We I
H. Wessel
Logik Berlin 1999

> Counter arguments against Wessel
> Counter arguments in relation to Equivalence

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Ed. Martin Schulz, access date 2017-05-26