Video: Dab tsi yog qhov sib npaug hauv kev ua lej tsis sib xws?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv lej , ib sib npaug Kev sib raug zoo yog ib qho kev sib raug zoo binary uas yog reflexive, symmetric thiab transitive. Kev sib raug zoo "yog sib npaug" yog qhov piv txwv canonical ntawm ib qho sib npaug Relation, qhov twg rau tej yam khoom a, b, thiab c: a = a (reflexive property), yog a = b thiab b = c ces a = c (transitive property).
Tsis tas li ntawd, qhov sib npaug hauv lej yog dab tsi?
Sib npaug txhais tau hais tias sib npaug ntawm tus nqi, kev ua haujlwm, lossis lub ntsiab lus. Hauv lej , sib npaug cov lej yog cov lej uas sau txawv tab sis sawv cev tib tus lej.
Dab tsi yog txoj cai ntawm tus kheej hauv kev ua lej tsis sib xws? Yog li cov kev cai lij choj , p∧T≡p, txhais tau hais tias kev sib txuas ntawm ib kab lus p nrog qhov kev txiav txim siab tautology T yuav ib txwm muaj qhov tseeb tus nqi raws li p (piv txwv li, yuav yog qhov sib npaug nrog p). Nws txhais tau hais tias qhov kev tsis sib haum xeeb ntawm ib kab lus p nrog qhov kev txiav txim siab tautology T yuav ib txwm muaj tseeb (yuav nws tus kheej yog tautology).
Tsis tas li ntawd, piv txwv li kev sib npaug sib npaug yog dab tsi?
Ib kev sib npaug ntawm lub teeb S, yog a kev sib raug zoo ntawm S uas yog reflexive, symmetrical thiab transitive. Piv txwv : Cia S = ℤ thiab txhais R = {(x, y) | x thiab y muaj tib qhov sib npaug} piv txwv li, x thiab y yog ob qho tib si lossis ob qho tib si khib. Lub parity kev sib raug zoo yog ib kev sib npaug.
Txoj cai lij choj ntawm kev sib npaug yog dab tsi?
Hauv logic thiab lej, nqe lus thiab hais tias yog logic sib npaug , yog hais tias lawv muaj pov thawj los ntawm ib leeg nyob rau hauv ib pawg ntawm axioms, los yog muaj qhov tseeb tus nqi nyob rau hauv txhua tus qauv. Cov logical sib npaug ntawm thiab qee zaum qhia tias yog,, lossis., nyob ntawm qhov kev sau ntawv siv.
Pom zoo:
Dab tsi yog kev cai lij choj ntawm tus kheej hauv kev ua lej tsis sib xws?
Yog li txoj cai lij choj ntawm tus kheej, p∧T≡p, txhais tau hais tias kev sib txuas ntawm ib kab lus p nrog qhov kev txiav txim siab tautology T yuav ib txwm muaj qhov tseeb tus nqi raws li p (piv txwv li, yuav yog qhov sib npaug nrog p). Nws txhais tau hais tias qhov kev tsis sib haum xeeb ntawm ib kab lus p nrog qhov kev txiav txim siab tautology T yuav ib txwm muaj tseeb (yuav nws tus kheej yog tautology)
Yuav daws qhov tsis sib npaug ntawm cov kab sib npaug thiab cov kab sib npaug sib npaug li cas?
Kev daws qhov tsis sib npaug ntawm qhov sib npaug yog zoo ib yam li kev daws cov kab sib npaug. Qhov sib txawv tseem ceeb yog koj tig lub cim tsis sib xws thaum faib lossis muab faib los ntawm tus lej tsis zoo. Graphing linear inequalities muaj ob peb qhov sib txawv ntxiv. Qhov uas yog qhov ntxoov ntxoo muaj xws li qhov tseem ceeb uas qhov kev tsis sib xws ntawm cov kab tawm muaj tseeb
Dab tsi yog qhov kev sib npaug sib npaug hauv lej?
Kev sib npaug. Ib qho kev sib npaug uas muaj tseeb rau qee tus nqi ntawm qhov sib txawv thiab tsis muaj tseeb rau lwm tus. Piv txwv li: Cov kab zauv 2x – 5 = 9 yog conditional vim nws tsuas yog muaj tseeb rau x = 7. Lwm qhov tseem ceeb ntawm x tsis txaus siab rau qhov sib npaug
Dab tsi yog qhov sib txawv ntawm kev sib tw thiab cov lej sib xws?
Peb siv cov lej sib xws los ua kom qhov teeb meem yooj yim dua los daws hauv peb lub taub hau los ntawm kev hloov txhua tus lej mus rau qhov ze tshaj kaum, nees nkaum, tsib caug lossis puas. Tab sis yog tias peb ua cov lej sib xws thiab sib npaug mus rau qhov ze tshaj plaws puas lossis kaum qhov chaw, 300 thiab 350 yog qhov yooj yim dua los suav hauv peb lub taub hau
Dab tsi yog qhov sib txawv ntawm cov kab lus sib npaug thiab qhov sib npaug sib npaug?
Cov kab lus sib npaug muaj qhov muaj txiaj ntsig zoo ib yam tab sis tau nthuav tawm nyob rau hauv ib hom ntawv sib txawv uas siv cov khoom ntawm cov lej xws li ax + bx = (a + b) x yog cov kab lus sib npaug. nruj me ntsis, lawv tsis yog 'sib npaug', yog li peb yuav tsum siv 3 kab sib luag hauv 'sib npaug' es tsis yog 2 raws li qhia ntawm no