Inverses for normal modal operators
Given a 1-ary sentence operator O, we describe L - another 1-ary operator - as a left inverse of O in a given logic if in that logic every formula φ is provably equivalent to LOφ. Similarly R is a right inverse of O if φ is always provably equivalent to ORφ. We investigate the behaviour of left and...
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| 格式: | Journal article |
| 語言: | English |
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Springer
1997
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