Pairwise disjoint events tsis muaj qhov tshwm sim zoo sib xws. … Ob qhov xwm txheej muaj kev sib koom ua ke yog tias qhov tshwm sim lawv ob leeg tshwm sim tib lub sijhawm (piv txwv li lawv lub koomhaum) yog xoom. Los ntawm cov ntsiab lus no, cov xwm txheej tsis sib koom ua ke (uas tsis muaj qhov tshwm sim zoo ib yam) kuj yog kev sib koom ua ke.
Yuav ua li cas thiaj nrhiav tau kev sib koom ua ke?
Yuav ua li cas thiaj nrhiav tau yog tias ob lub teeb yog Disjoint? Txhawm rau txiav txim siab seb ob pawg puas yog cov teeb tsa tsis sib xws, txhua yam koj yuav tsum ua yog ua haujlwm kev sib tshuam. Disjoint sets yuav tsis muaj ib qho piv txwv ntawm lawv. Yog li ntawd, lawv txoj kev sib tshuam yuav ib txwm tsis muaj teeb meem.
Puas yog disjoint tib yam li pairwise disjoint?
Lub sij hawm disjoint yog hais txog kev sau ntawm subsets, nws txhais tau tias nws cov subsets yog disjoint. Lo lus pairwise disjoint yog hais txog ib tsev neeg ntawm kev sau ntawm subsets.
Dab tsi yog cov piv txwv ntawm kev sib cais?
Hauv kev ua lej, ob pawg tau hais tias yog cov teeb tsa tsis sib xws yog tias lawv tsis muaj cov ntsiab lus sib xws. Sib npaug, ob lub disjoint teeb yog cov teeb uas nws qhov kev sib tshuam yog qhov khoob. Piv txwv li, {1, 2, 3} thiab {4, 5, 6} yog cov teeb tsa tsis sib xws, thaum {1, 2, 3} thiab {3, 4, 5} tsis yog kev tsis sib haum.
Dab tsi yog kev sib koom ua ke?
Peb hais tias cov teeb hauv A yog kev sib koom ua ke yog tias tsis muaj ob leeg muaj cov ntsiab lus sib xws. Hauv lwm lo lus, yog A, B∈A, thiab A≠B, ces A∩B=∅.
