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Scattered order : ウィキペディア英語版
Scattered order

In mathematical order theory, a scattered order is a linear order that contains no densely ordered subset with more than one element (Harzheim 2005:193''ff.'')
A characterization due to Hausdorff states that the class of all scattered orders is the smallest class of linear orders which contains the singleton orders and is closed under well-ordered and reverse well-ordered sums.
Laver's theorem (generalizing Fraïssé's conjecture) states that the embedding relation on the class of countable unions of scattered orders is a well-quasi-order (Harzheim 2005:265).
The order topology of a scattered order is scattered. The converse implication does not hold, as witnessed by the lexicographic order on \mathbb Q\times\mathbb Z.
==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)
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