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・ Spider Baby
・ Spider beetle
・ Spider behavior
・ Spider Bennett
・ Spider bite
・ Spider Blues
・ Spider Bones
・ Spider Boom
・ Spider Boy (novel)
・ Spider Bridge at Falls of Schuylkill
・ Spider cannibalism
・ Spider Cave
・ Spider Cave (Gibraltar)
・ Spider Clark
・ Spider crater
Spider diagram
・ Spider eater
・ Spider Eye Productions
・ Spider fighting
・ Spider flower
・ Spider Forest
・ Spider Girl
・ Spider Girls
・ Spider Glacier (Phelps Ridge, Washington)
・ Spider Glacier (Spider Mountain, Washington)
・ Spider Grandmother
・ Spider Harrison
・ Spider Hill
・ Spider hole
・ Spider in the Web


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Spider diagram : ウィキペディア英語版
Spider diagram

In mathematics, a unitary spider diagram adds existential points to an Euler or a Venn diagram. The points indicate the existence of an attribute described by the intersection of contours in the Euler diagram. These points may be joined together forming a shape like a spider. Joined points represent an "or" condition, also known as a logical disjunction.
A spider diagram is a boolean expression involving unitary spider diagrams and the logical symbols \land,\lor,\lnot. For example, it may consist of the conjunction of two spider diagrams, the disjunction of two spider diagrams, or the negation of a spider diagram.
== Example ==

In the image shown, the following conjunctions are apparent from the Euler diagram.
: A \land B
: B \land C
: F \land E
: G \land F
In the universe of discourse defined by this Euler diagram, in addition to the conjunctions specified above, all possible sets from ''A'' through ''B'' and ''D'' through ''G'' are available separately. The set ''C'' is only available as a subset of ''B''. Often, in complicated diagrams, singleton sets and/or conjunctions may be obscured by other set combinations.
The two spiders in the example correspond to the following logical expressions:
* Red spider: (F \land E) \lor (G) \lor (D)
*Blue spider: (A) \lor (C \land B) \lor (F)

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「Spider diagram」の詳細全文を読む



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