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・ Centered cube number
・ Centered decagonal number
・ Centered dodecahedral number
・ Centered heptagonal number
・ Centered hexagonal number
・ Centered icosahedral number
・ Centered in the Universe
・ Centered nonagonal number
・ Centered octagonal number
・ Centered octahedral number
・ Centered pentachoric number
・ Centered pentagonal number
・ Centered polygonal number
・ Centered polyhedral number
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Centered set
・ Centered square number
・ Centered tetrahedral number
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・ Centered triangular number
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Centered set : ウィキペディア英語版
Centered set
In mathematics, in the area of order theory, an upwards centered set ''S'' is a subset of a partially ordered set, ''P'', such that any finite subset of ''S'' has an upper bound in ''P''. Similarly, any finite subset of a downwards centered set has a lower bound. An upwards centered set can also be called a consistent set. Note that any directed set is necessarily centered, and any centered set is linked.
A subset ''B'' of a partial order is said to be σ-centered if it is a countable union of centered sets.
== References ==

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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「Centered set」の詳細全文を読む



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