ob-dimensional. npe. ntawm, having, los yog hais txog ob qhov ntev, feem ntau piav qhia txog qhov ntev thiab dav lossis ntev thiab qhov siab. dag ntawm lub dav hlau; muaj ib cheeb tsam tab sis tsis enclosing tej ntim. tsis muaj qhov tob, raws li cov cim hauv kev sau ntawv.
txhais li cas yog ib yam dab tsi yog 2 seem?
1: ntawm, ntsig txog, lossis muaj ob qhov loj me. 2: tsis muaj qhov illusion ntawm qhov tob: tsis yog peb-dimensional. 3: tsis muaj qhov tob ntawm cov cim ob sab.
piv txwv ntawm ob sab yog dab tsi?
Ib lub voj voog, square, duab plaub, thiab daim duab peb sabyog qee qhov piv txwv ntawm ob sab khoom thiab cov duab no tuaj yeem kos rau ntawm daim ntawv. Tag nrho cov duab 2-D muaj ob sab, vertices (pob), thiab cov ces kaum sab hauv, tshwj tsis yog lub voj voog, uas yog daim duab nkhaus.
tus 2 seem hu ua dab tsi?
Ib tus cwj pwm ob sab yog tib yam li ib tus cwj pwm tshwj tsis yog qhov tseeb tias lawv qhia ib qho kev xav lossis tus cwj pwm zoo. Lawv tseem hu ua "daim ntawv" cim, koj cov ntawv txiav, vim lawv tsis muaj qhov loj me.
Dab tsi yog lo lus rau ob sab?
Nrhiav lwm lo lus rau ob sab. Hauv nplooj ntawv no koj tuaj yeem tshawb pom 19 cov lus sib txawv, cov lus sib txawv, cov lus qhia, thiab cov lus hais txog ob sab, xws li: 2-dimensional, 3-dimensional, planar, tiaj, kab, kab, cubic, peb-dimensional,, ib-dimensional,4-dimensional thiab 1-d.
