Ib nqe lus biconditional yog ib nqe lus sib txuas lus nrog nws cov lus sib tham. Yog li, ib qho xwm txheej muaj tseeb yog tias thiab tsuas yog tias lwm qhov yog qhov tseeb thiab. Nws feem ntau siv cov lus, "yog tias thiab tsuas yog" lossis luv luv "iff." Nws siv ob lub xub los ceeb toom koj tias qhov xwm txheej yuav tsum muaj tseeb hauv ob qho kev qhia.
Ib qho piv txwv ntawm ib nqe lus biconditional yog dab tsi?
Bicconditional Nqe Lus piv txwv
Lub polygon tsuas muaj plaub sab yog tias thiab tsuas yog lub polygon yog plaub fab. Lub polygon yog quadrilateral yog thiab tsuas yog tias lub polygon tsuas muaj plaub sab. Lub quadrilateral muaj plaub congruent sab thiab cov ces kaum yog thiab tsuas yog hais tias lub quadrilateral yog ib tug square.
Yuav sau dab tsi ua ib nqe lus biconditional?
' Cov nqe lus biconditional yog cov lus tseeb uas muab cov kev xav thiab qhov xaus nrog cov lus tseem ceeb 'if thiab tsuas yog. ' Piv txwv li, nqe lus yuav siv daim ntawv no: (hypothesis) yog thiab tsuas yog (lus xaus). Peb kuj tuaj yeem sau nws li no: (qhov xaus) yog tias thiab tsuas yog (hypothesis).
nqe lus biconditional txawv ntawm nqe lus li cas?
Raws li lub npe qhov sib txawv ntawm qhov xwm txheej thiab biconditional. yog tias conditional yog (grammar) ib kab lus raws cai; ib nqe lus uas nyob ntawm qhov xwm txheej yog qhov tseeb lossis tsis tseeb thaum biconditional yog (logic) ib qho "yog tias thiab tsuas yog" xwm txheejwherein qhov tseeb ntawm txhua nqe lus nyob ntawm qhov tseeb ntawm lwm tus.
P → Q? yog dab tsi?
Cov lus qhia biconditional “p yog thiab tsuas yog q,” txhais tau tias p⇔q, yog qhov tseeb thaum ob qho tib si p thiab q nqa qhov tseeb tus nqi, thiab yog qhov tsis tseeb. Nws yog qee zaum abbreviated li "p iff q." Nws cov lus tseeb yog piav qhia hauv qab no. … Ib nqe lus biconditional feem ntau yog siv los txhais lub tswvyim tshiab.
