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U Vikipediyi ye statti pro inshi znachennya cogo termina Ideal Ideal v teoriyi poryadku pidmnozhina I chastkovo vporyadkovanoyi mnozhini P dlya yakoyi vikonuyutsya umovi Dlya dovilnih x I y P yaksho y x to y I nizhnya mnozhina Dlya dovilnih x y I isnuye z I takij sho x z ta y z spryamovana vverh mnozhina Dlya gratok viznachennya idealu perefrazovuyetsya tak pidmnozhina I gratki P ye idealom todi i tilki todi koli nizhnya mnozhina zamknuta vidnosno operaciyi join tobto dlya dovilnih x y I element x displaystyle vee y I Ideal ponyattya dvoyiste do filtra Prostij idealProstij ideal ideal dopovnennyam yakogo ye filtr Maksimalnij idealMaksimalnij ideal ideal dlya yakogo ne isnuye bilshogo ideala Divis takozhIdeal algebra Filtr poryadok Teorema pro bulevi prosti idealiDzherelaBirkgof G Teoriya reshyotok per s angl V N Salij pod red L A Skornyakova 3 e izd Moskva Nauka 1984 568 s ros
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