Keywords: KaisekiGairon-369-1.svg en A surface S is divided into small curved quadrates with u-curves and v-curves and ABCD is one of those quadrates \theta is the angle between the tangent lines of the arcs AB and AC at A 高 貞治:解析概論 改訂第三版[軽装版] p 369 の図 tesigana 2011-02-22 PD-Japan 解析概論 |