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Logic - Wikipedia, the free encyclopedia (3434 words) |
 | It was not alone: the Stoics proposed a system of propositional logic that was studied by medieval logicians; nor was the perfection of Aristotle's system undisputed; for example the problem of multiple generality was recognised in medieval times. |
| With predicate logic, for the first time, logicians were able to give an account of quantifiers general enough to express all arguments occurring in natural language. |
| As a result, philosophical logicians have contributed a great deal to the development of non-standard logics (e.g., free logics, tense logics) as well as various extensions of classical logic (e.g., modal logics), and non-standard semantics for such logics (e.g., supervaluation semantics). |
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