Yuav ua li cas koj pom qhov tsis lees paub ntawm nqe lus?
Yuav ua li cas koj pom qhov tsis lees paub ntawm nqe lus?

Video: Yuav ua li cas koj pom qhov tsis lees paub ntawm nqe lus?

Video: Yuav ua li cas koj pom qhov tsis lees paub ntawm nqe lus?
Video: yuav ua li cas koj thiaj lis paub 2024, Kaum ib hlis
Anonim

Cov negation ntawm ib nqe lus yog qhov opposite ntawm lub nqe lus . Nws yog 'tsis' ntawm ib nqe lus . Yog ib nqe lus yog sawv cev los ntawm p, ces tus kev tsis pom zoo yog sawv cev los ntawm ~p. Piv txwv li, The nqe lus "Nws los nag" muaj ib kev tsis pom zoo ntawm "Nws tsis los nag".

Kuj nug, dab tsi yog qhov tsis lees paub ntawm nqe lus?

Negation . Qee lub sij hawm hauv kev ua lej nws tseem ceeb heev kom txiav txim siab qhov txawv ntawm qhov muab lej nqe lus yog. Qhov no feem ntau yog hu ua " negating "a nqe lus . Ib yam uas yuav tsum nco ntsoov yog tias a nqe lus yog muaj tseeb, ces nws kev tsis pom zoo yog cuav (thiab yog tias a nqe lus yog cuav, ces nws kev tsis pom zoo yog muaj tseeb).

Kuj Paub, piv txwv li negation yog dab tsi? Hauv Piv txwv 8, thaum x yog qhov tseeb, ~ x yog cuav; thiab thaum x yog cuav, ~ x yog qhov tseeb. Los ntawm cov lus tseeb no, peb tuaj yeem pom tias ib nqe lus thiab nws kev tsis pom zoo muaj qhov sib txawv qhov tseeb. Cov kev tsis pom zoo ntawm nqe lus p yog "tsis yog p", cim los ntawm "~p". Ib nqe lus thiab nws kev tsis pom zoo muaj qhov sib txawv qhov tseeb.

Tsis tas li ntawd, Daim Ntawv Qhia piv txwv yog dab tsi?

Lub ntsiab txhais ntawm a nqe lus yog ib yam uas tau hais los yog sau, lossis ib daim ntawv qhia txog qhov nyiaj tshuav nyiaj li cas. Ib piv txwv ntawm nqe lus yog thesis ntawm ib daim ntawv. Ib piv txwv ntawm nqe lus yog daim npav rho nyiaj.

Dab tsi yog Contrapositive ntawm nqe lus?

Contrapositive . Hloov lub hypothesis thiab xaus ntawm ib tug conditional nqe lus thiab negating ob leeg. Piv txwv li, lub contrapositive ntawm "Yog los nag ces nyom ntub" yog "Yog nyom tsis ntub ces tsis los nag." Nco tseg: Raws li hauv qhov piv txwv, lub contrapositive ntawm tej qhov tseeb proposition kuj muaj tseeb.

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