Crossed Trough[Crossed Trough] - 达人(其实～我是卧底，来自外星)

2005/02/05 | Crossed Trough[Crossed Trough]
类别(∑〖数学〗) | 评论(0) | 阅读(23) | 发表于 13:30: <APPLET CODE="http://mathworld.wolfram.com/Live.class" CODEBASE="live" ARCHIVE="http://mathworld.wolfram.com/live.jar" ALIGN=MIDDLE WIDTH=300 HEIGHT=300 ALT="Crossed trough"> <PARAM NAME="input_file" VALUE="http://mathworld.wolfram.com/crosstr.m"> <PARAM NAME="input_archive" VALUE="http://mathworld.wolfram.com/zip/crosstr.zip">
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The crossed trough is the surface
(1)

The coefficients of its first fundamental form are
(2)

(3)

(4)

and of the second fundamental form are
(5)

(6)

(7)

The Gaussian and mean curvatures are
(8)

(9); 0