Wp/lus/Khawnpéng

En bawk la : Khawnkhâwm, Khawnkhawmzirna

A hi B khawnpéng

Khawnpéng tih hi khawnkhâwm, khawnkhâwm dang chhunga awm lehchhawng sawi nan kan hmang.

Chhiarkawp hrilhfiahna

A hi khawnkhâwm ni se, B hi khawnkhâwm lo ni ve bawk ta se. A chhungkhung apiang B chhungkhung a nih vè zël chuan A hi B khawnpéng kan ti. A chhinchhiahnain "A$\subset$B" tiin kan ziak.

Entirna

• $A=\lbrace 1, 2, 3, 4\rbrace$ lo ni sé, $B=\lbrace 1, 2, 3, 4, 5, 6, 7, 8\rbrace$ lo ni bawk ta se, A hi B khawnpéng a ni. A$\subset$B tiin kan ziak.
• $A=\lbrace a\in\mathbb{Q}\mid a>0\rbrace$ lo ni se, $B=\lbrace a\in \mathbb{R}\mid a>0\rbrace$ lo ni bawk se, A hi B khawnpéng a ni.

Chhinchhiahna

Kan sawi tawh angin A hi B khawnpéng a nih chuan "A$\subset$B" tiin kan ziak a, "A hi B khawnpéng a ni" tia chhiar mai tùr. Heti zawng pawh hian a ziah theih: "B$\supset$A". Hei hi "A hi B khawnpéng a ni" tia a chhiar theih tho rualin, a chhinchhiahna hawizawng milin "B-in A a dawlh" ti pawhin kan sawi bawk; A hi B chhunga a awm avangin a dawlh angin kan sawi a ni.

Thulâkna

• Halmos, Paul R., Naive Set Theory, Springer-Verlag, 1960