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Regular modal logic : ウィキペディア英語版
Regular modal logic
In modal logic, a regular modal logic L is a modal logic closed under the duality of the modal operators:
\Diamond A \equiv \lnot\Box\lnot A
and the rule
(A\land B)\to C \vdash (\Box A\land\Box B)\to\Box C.
Every regular modal logic is classical, and every normal modal logic is regular and hence classical.
== References ==
Chellas, Brian. ''Modal Logic: An Introduction''. Cambridge University Press, 1980.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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