## Philosophy Lexicon of Arguments | |||

Modal logic: the modal logic is an extension of classical logic to systems in which possibility and necessity can also be expressed. Different approaches use operators to express "necessary" and "possible", which, depending on the placement within formulas, can let claims of different strengths win. E.g. there is an object which necessarily has the property F/it is necessary that there is an object with the property F. The introduction of possible worlds makes quantification possible for expressing possibility (There is at least one world in which ...) and necessity (For all worlds is valid ...). See also operators, quantifier, completion, range, possible worlds. | |||

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Books on Amazon |
Berka I 161 Modal logic/Undecidability: Kripke (1962) proved the undecidability of modal digit prediacte calculus - (functions with one argument). |
K I S.A. Kripke Name und Notwendigkeit Frankfurt 1981 K III S. A. Kripke Outline of a Theory of Truth (1975) InRecent Essays on Truth and the Liar Paradox, R. L. Martin (Hg), Oxford/NY 1984 Brk I K. Berka/L. Kreiser Logik Texte Berlin 1983 |

> Counter arguments against **Kripke**

> Counter arguments in relation to **Modal Logic**

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Ed. Martin Schulz, access date 2017-05-25