理論天文組的天體力學研習班
各位組員:本星期日上午10:00國際台World of learning 會播以下的節目,不知道會否對我們昨夜的討論有幫助與否.
透視中的圓錐體切面
所有的二次圓錐曲線都可視為圓錐體的某個切面。所以從透視的角度來說，它們都是等同的。這種現象可被用來証明平面幾何中的一個相當有趣的定理。Thank you.
http://www.ouhk.edu.hk/WCM/?FUELAP_SITEDBID=SITE%5F%2D66&FUELAP_OP=FUELOP_NewScreen&FUELAP_TEMPLATENAME=tcOLE2%5F2004&LANG=chi&OLE_DATE=29&CALENDA=true&OLE_MONTH=JUNE&OLE_YEAR=2008&ITEMID=ETP%5FAVCONTENT%5F35136659&DIS=1&TOB=true&
Conics in Perspective
All conic sections can be found as slices of some cone and are therefore perspectively equivalent. This result is used to prove an interesting theorem in two-dimensional geometry.
Sing Dear Sing,
Thanks your information.
Best regards,
Hilda
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