A solution to a problem of Urquhart (Q1177648)
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scientific article; zbMATH DE number 20837
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | A solution to a problem of Urquhart |
scientific article; zbMATH DE number 20837 |
Statements
A solution to a problem of Urquhart (English)
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26 June 1992
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This note presents a modal logic containing S4 which has the finite model property, is recursively axiomatizable, but is not decidable; it thus answers a question of Urquhart's positively.
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decidability
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modal logic
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S4
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finite model property
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recursively axiomatizable
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