π-system

名词 n.

英文释义

名词 n.
  1. A non-empty collection of subsets of a given set Ώ that is closed under non-empty finite intersections.
    — To see this, first check that #92;sigma(X#95;0,X#95;1,#92;dots)#61;#92;sigma(#92;mathcalF#95;0), where #92;textstyle#92;mathcalF#95;0#58;#61;#92;bigcup#92;infty#95;#123;k#61;0#125;#92;sigma(X#95;0,#92;dots,X#95;k) is a field and, in particular, a #92;boldsymbol#92;pi-system.

词形变化

π-systems plural pi-system alternative
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