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subjunctive possibility
Subjunctive possibility (also called alethic possibility) is the form of modality most frequently studied in modal logic. Subjunctive possibilities are the sorts of possibilities we consider when we conceive of counterfactual situations; subjunctive modalities are modalities that bear on whether a statement ''might have been'' or ''could be'' true—such as ''might'', ''could'', ''must'', ''possibly'', ''necessarily'', ''contingently'', ''essentially'', ''accidentally'', and so on. Subjunctive possibilities include logical possibility, metaphysical possibility, nomological possibility, and temporal possibility.
== Subjunctive possibility and other modalities ==
Subjunctive possibility is contrasted with (among other things) epistemic possibility (which deals with how the world ''may'' be, ''for all we know'') and deontic possibility (which deals with how the world ''ought'' to be).
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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