理論天文組的天體力學研習班

Astrosing

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/?FUEL ... 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

hildawfsung

Dear Sing,

Thanks your information.

Best regards,

Hilda