数学吧 关注:918,852贴子:8,850,750
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求救。拓扑学。会的亲帮个忙。。好难啊完全不会画图和计算。。。

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The surface A⊂R3 is the union of a vertical cylinder Amid, of radius 1, height 2 and centredat the origin,and two semi-spheres A+ and A− of radius1, capping the top and bottom of Amid.Sketch and parametrise A. (It suffices to give parametrisations for Amid, A+ and A− separately.)


来自手机贴吧1楼2012-08-05 14:26回复
    与拓扑有关系么


    3楼2012-08-05 14:31
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      2025-08-17 01:38:47
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      4楼2012-08-09 11:49
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        Amid: x^2+y^2=1 && -1<=z<=1
        A+: z=+1+sqrt(1-x^2-y^2)
        A-: z=-1-sqrt(1-x^2-y^2)
        sqrt(a) 表示 a 的正的平方根。


        6楼2012-08-09 13:24
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