Tsheb saib iav pom kev faib tawm
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Daim iav pom tom qab tau muab faib los ntawm txoj haujlwm teeb tsa, suav nrog cov iav sab nrauv saib, qis daim iav pom tom qab thiab cov iav nyob sab hauv tsev saib. Muab faib los ntawm kev siv, lub tsom iav sab nrauv sab nrauv saib raws qhov pom tom qab lub tsheb, daim iav qis-nrawm pom daim iav tig rau sab pem hauv ntej thiab hauv qab tsheb, thiab tsom iav sab hauv saib sab nraud yog qhov cuam tshuam rau lub tsheb tom qab thiab sab hauv. Rau cov laj thawj sib txawv, cov qauv iav yuav txawv. Muaj ob hom tsom iav dav dav, ib qho yog iav tsom iav. Raws li lub npe cuam tshuam, daim iav yog tiaj. Lub sij hawm yog "qhov hluav taws xob ntawm curvature ntawm lub npoo R yog infinite". Qhov no yog tib yam li cov tsev iav dav dav, uas tuaj yeem txais cov duab tib yam nrog lub pom me me. Daim iav dav hlau no feem ntau siv los ua daim iav sab hauv. Lwm qhov yog convex iav, uas yog kheej kheej zoo thiab muaj qhov sib txawv ntawm curvature. Nws cov duab yog me dua li ntawm qhov kev ntsuam xyuas qhov muag, tab sis nws daim teb ntawm lub zeem muag yog qhov loj, zoo li lub luag haujlwm ntawm lub koob yees duab "dav-tsom iav". Daim iav convex no feem ntau siv los ua lub ntsej muag sab nrauv-saib iav thiab qis qis-saib iav. Cov tsheb thauj neeg caij tsheb thiab lwm cov tsheb thauj neeg lub teeb feem ntau muaj cov tsom iav sab nrauv thiab sab hauv, thaum cov tsheb loj coj mus muag (cov tsheb loj thiab cov tsheb) feem ntau muaj cov tsom iav sab nrauv, sab qis thiab sab hauv.
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