Puas yog cov kab sib npaug sib ntsib hauv infinity?
Puas yog cov kab sib npaug sib ntsib hauv infinity?

Video: Puas yog cov kab sib npaug sib ntsib hauv infinity?

Video: Puas yog cov kab sib npaug sib ntsib hauv infinity?
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Hauv qhov projective geometry, ib khub ntawm kab ib txwm cuam tshuam ntawm qee qhov chaw, tab sis parallel kab ua tsis yog sib tshuam nyob rau hauv lub dav hlau tiag. Cov kab ntawm tsis kawg yog ntxiv rau lub dav hlau tiag. Qhov no ua tiav lub dav hlau, vim tam sim no parallel kab sib tshuam ntawm qhov point uas yog nyob rau ntawm kab ntawm tsis kawg.

Tsis tas li ntawd, cov kab sib txuas puas sib ntsib?

Parallel kab ua tsis yog ntsib Ntawm qhov taw tes. Cov ntu ntawm Wikipedia muaj nqis heev ntawm no: Hauv geometry, kab sib npaug yog kab hauv ib lub dav hlau uas ua tsis yog ntsib ; uas yog , ob kab hauv ib lub dav hlau uas ua tsis sib tshuam los yog kov ib leeg ntawm ib qho twg yog hais tias yuav thaum uas tig mus.

Ib yam li ntawd, cov kab nkhaus puas tuaj yeem sib npaug? Raws li rau kab sib npaug , ib normal kab rau a nkhaus kuj yog ib txwm rau nws cov parallels. Thaum twg thaum uas tig mus curves yog tsim lawv yuav muaj cusps thaum nyob deb ntawm qhov nkhaus phim lub vojvoog ntawm curvature.

Ib tug kuj nug, ua 2 kab sib txuas sib txuas?

Hauv qhov projective geometry, ib khub ntawm kab ib txwm kev sib tshuam ntawm qee qhov taw tes, tab sis parallel kab ua tsis yog sib tshuam nyob rau hauv lub dav hlau tiag. Cov kab ntawm infinity yog ntxiv rau lub dav hlau tiag. Qhov no ua tiav lub dav hlau, vim tam sim no parallel kab sib tshuam nyob rau hauv ib qho chaw uas lies ntawm lub kab ntawm infinity.

Puas yog cov kab sib txuas sib tshuam ntawm cov ces kaum sab xis?

Parallel kab yog kab nyob rau hauv ib lub dav hlau uas ib txwm sib nrug deb. Parallel kab yeej tsis sib tshuam . Perpendicular kab yog kab uas sib tshuam ntawm a txoj cai (90 degree) lub kaum sab xis.

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