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

Books on Amazon
SL I 6
Equivalences/modal logic/Stuhlmann-Laeisz: relationship between operators - E.g. necessary: not possible that ~ a - offered: if not allowed that a ~ - believed: if not thought possible that ~ a. - Will always be the case: if not once the case that ~ a.

R. Stuhlmann-Laeisz
Freges Logische Untersuchungen Darmstadt 1995

> Counter arguments in relation to Equivalence

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Ed. Martin Schulz, access date 2017-05-24