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・ Country-Folk
・ Country-of-origin effect
・ Country-western dance
・ Country-western two-step
・ Countrycide
・ Countryfied
・ Countryfied (Hank Williams song)
・ Countryfile
・ Countryliner
・ CountryLink
・ Countryman
・ Countryman (album)
・ Countryman (film)
・ Countryman (magazine)
・ Countryman (surname)
Countryman line
・ CountryMark
・ Countrypärlor
・ Countrypärlor 2
・ Countryside (disambiguation)
・ Countryside (Åland)
・ Countryside Agency
・ Countryside Alliance
・ Countryside and Rights of Way Act 2000
・ Countryside Commission
・ Countryside Council for Wales
・ Countryside High School
・ Countryside La Vie
・ Countryside Lake
・ Countryside Live


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Countryman line : ウィキペディア英語版
Countryman line
A Countryman line is an uncountable linear ordering whose square is the union of countably many chains. The existence of Countryman lines was first proven by Shelah. Shelah also conjectured that, assuming PFA, every Aronszajn line contains a Countryman line. This conjecture, which remained open for three decades, was proven by Justin Moore.
==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「Countryman line」の詳細全文を読む



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