Yog tias ob qhov xwm txheej tsis muaj qhov sib koom ua ke (Lawv kev sib tshuam yog qhov khoob.), cov xwm txheej raug hu ua kev sib koom ua ke. Yog li, P(A∩B)=0. Qhov no txhais tau tias qhov tshwm sim ntawm qhov tshwm sim A thiab qhov tshwm sim B tshwm sim yog xoom.
Puas muaj kev sib koom ua ke tshwj xeeb muaj kev sib tshuam?
Yog li ntawd, ob qhov xwm txheej tshwj xeeb tsis tuaj yeem tshwm sim. Raws li txoj cai hais, kev sib tshuam ntawm txhua ob ntawm lawv yog khoob (qhov kev tshwm sim null): A ∩ B=∅. Yog li ntawd, kev sib koom ua ke tshwj xeeb muaj cov cuab yeej: P(A ∩ B)=0.
Yuav ua li cas yog tias ob qhov xwm txheej sib koom ua ke?
Ob qhov xwm txheej yog sib koom ua ke yog tias lawv tsis tuaj yeem tshwm sim tib lub sijhawm. … Yog tias ob qhov xwm txheej tsis sib haum, ces qhov tshwm sim ntawm qhov tshwm sim yog qhov suav ntawm qhov tshwm sim ntawm txhua qhov tshwm sim.
Thaum cov xwm txheej sib koom ua ke Dab tsi tshwm sim ntawm lawv qhov kev sib tshuam?
Yog tias ob qhov xwm txheej sib koom ua ke, lawv tsis tuaj yeem tshwm sim hauv tib qho kev sim: qhov tshwm sim ntawm lawv qhov kev sib tshuam yog zero. Qhov tshwm sim ntawm lawv lub union yog cov lej ntawm lawv qhov tshwm sim.
Puas muaj kev sib koom ua ke tsis muaj kev sib tshuam?
Nug: Cov xwm txheej tshwj xeeb muaj kev sib tshuam tsis yog kev sib tshuam.
