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Words near each other
・ Window Maker
・ Window manager
・ Window Media
・ Window Observational Research Facility
・ Window of opportunity
・ Window of Opportunity (Stargate SG-1)
・ Window of the World
・ Window of the World (Changsha)
・ Window of the World Monorail
・ Window of the World Station
・ Window on China Theme Park
・ Window on Main Street
・ Window on the Plains Museum
・ Window on the World
・ Window on the World (disambiguation)
Window operator
・ Window paper-cuts
・ Window Peak
・ Window period
・ Window Rock Airport
・ Window Rock High School
・ Window Rock Unified School District
・ Window Rock, Arizona
・ Window screen
・ Window seat
・ Window Seat (song)
・ Window seat (type of sofa)
・ Window Seats
・ Window Shopper
・ Window Shopping


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Window operator : ウィキペディア英語版
Window operator

In modal logic, the window operator \triangle is a modal operator with the following semantic definition:
M,w\models\triangle\phi \iff \forall u, M,u\models\phi\Rightarrow Rwu
for M=(W,R,f) a Kripke model and w,u\in W. Informally, it says that ''w'' "sees" every φ-world (or every φ-world is seen by ''w''). This operator is not definable in the basic modal logic (i.e. some propositional non-modal language together with a single primitive "necessity" (universal) operator, often denoted by '\square', or its existential dual, often denoted by '\Diamond'). Notice that its truth condition is the converse of the truth condition for the standard "necessity" operator.
For references to some of its applications, see the References section.
== References ==

*

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Window operator」の詳細全文を読む



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