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vsroot

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[] Ϊʲôһʱ˵ǷŷΣһʱ˵΢ּ

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СľAndroidͻ
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zaq123321

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л룬Ӧָ +1
vsroot: +10, а 2015-09-20 15:18:13
vsroot: +5, а 2015-10-16 18:05:43
Riemannian geometry is a global differential geometry. Locally we can define local coordinates and treat it as Euclidean space. We can define inner product, metric and angle etc. Differential geometry is opposite to integral geometry. When we talk about smoothness, we want to do differential. Thus Riemannian geometry is one kind of differential geometry since we need differential to calculate normal vector, tangent vector, and of course curvatures. There are many kinds of metric you can define locally. If it's Riemannian metric, you get Riemannian geometry. If you define other kinds of metric, you get other kinds of differential geometry.
СľůϣҪСľ档
2015-09-20 05:14:10
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sskkyy

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л룬Ӧָ +1
vsroot: +10, а 2015-09-20 15:18:27
ƶѣÿ˲ͬĽзIJص㲻һǷŷλǵһ˵ɷо

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2015-09-20 09:32:07
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vsroot

(С)

û:
: Originally posted by sskkyy at 2015-09-20 09:32:07
ƶѣÿ˲ͬĽзIJص㲻һǷŷλǵһ˵ɷо

֪ںܷܶŷε鶼漰һ£ŷηΪ˫ΣԲΣԲֽ

СľAndroidͻ
2015-09-20 11:25:41
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˹

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2015-09-20 12:35:09
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maojun1998

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л룬Ӧָ +1
vsroot: +5, а 2015-10-16 18:01:48
עĽǶȲͬŷʽιעƽйоεĶ繴ɶŷʽεĶ

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wirmssenwissen.wirwerdeneswissen.
12¥2015-09-20 22:57:01
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ͨ

mygt_hit

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л룬Ӧָ +1
vsroot: +15, а 2015-09-20 15:18:39
feixiaolin: +5, http://emuch.net/bbs/viewthread.php?tid=9452448&fpage=1 +5 2015-10-03 08:14:41
ݹ˵ŷǵ5裨ֱ֪һ㣬ֻһֱֱ֪ƽУļΡڷŷε˼Ϸչ˸㷺Ρ
֪Ȼ֪Ȼ
2015-09-20 11:09:53
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vsroot

(С)

û:
: Originally posted by zaq123321 at 2015-09-20 05:14:10
Riemannian geometry is a global differential geometry. Locally we can define local coordinates and treat it as Euclidean space. We can define inner product, metric and angle etc. Differential geometr ...

˵ԲΣ'Բ"?
2015-09-20 11:59:34
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vsroot

(С)

û:
: Originally posted by ˹ at 2015-09-20 12:35:09
DzͬǶ˵

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СľAndroidͻ
2015-09-20 13:12:20
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˹

(ʽд)

û:
: Originally posted by sskkyy at 2015-09-20 09:32:07
ƶѣÿ˲ͬĽзIJص㲻һǷŷλǵһ˵ɷо

ŷεĴ֮һ

СľAndroidͻ
2015-09-20 13:17:36
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ľ

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feixiaolin: +2 2015-09-23 17:21:43
ǴӲͬǶ˵ģʵͬһһǿǷŷʱ˵ռŷʽռIJҲǵ幫IJͬ˵΢ּʱǿоռõķ΢γоҪѧ֧ĸҪǵоо
10¥2015-09-20 14:48:12
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