The number of nonnormal extensions of S4 (Q1104919)
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scientific article; zbMATH DE number 4057478
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | The number of nonnormal extensions of S4 |
scientific article; zbMATH DE number 4057478 |
Statements
The number of nonnormal extensions of S4 (English)
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1988
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With the use of methods of K. Fine the author proves that there exist \(2^{\aleph_ 0}\) nonnormal extensions of the modal logic S4.
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nonnormal extensions
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modal logic S4
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