|Biconditional: notation ↔; a statement that is true if the two sides have the same truth value ("true" or "false"). The biconditional (also bisubjunction) is part of the object language. Contrary to that is equivalence (⇔) which belongs to meta language. A biconditional that is always true is an equivalence._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments. |
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Biconditional, weak: A B is weak valid if no statement can be true without the other even when both are evaluated differently (assertibility, renunciation of bivalence) - strong: if A and B are always necessarily given the same evaluation._____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.
Wahrheit und Objektivität Frankfurt 2001
G. H. von Wright
Erklären und Verstehen Hamburg 2008