W*k
2 楼
【 以下文字转载自 History 讨论区 】
发信人: robck (万廷), 信区: History
标 题: Re: 观《建党伟业》有感
发信站: BBS 未名空间站 (Sun Jun 19 11:29:18 2011, 美东)
学一下复变就明白了,不但正无穷和负无穷两个方向,甚至复平面上所有方向到无穷远
都汇聚到一个点。
还有一个简单的解释,正无穷和负无穷的倒数都是0,所以他们就是一个东西。
发信人: robck (万廷), 信区: History
标 题: Re: 观《建党伟业》有感
发信站: BBS 未名空间站 (Sun Jun 19 11:29:18 2011, 美东)
学一下复变就明白了,不但正无穷和负无穷两个方向,甚至复平面上所有方向到无穷远
都汇聚到一个点。
还有一个简单的解释,正无穷和负无穷的倒数都是0,所以他们就是一个东西。
a*y
3 楼
豆豆来家一周年了~ p(^o^)q
希望家豆以后老是这么快快乐乐,好好吃好好睡撒撒娇看看鸟打打牌,然后和粑粑麻麻
一起幸福成长和变老~~
希望家豆以后老是这么快快乐乐,好好吃好好睡撒撒娇看看鸟打打牌,然后和粑粑麻麻
一起幸福成长和变老~~
f*n
5 楼
豆豆真漂亮
a*y
7 楼
Merry Christmas and Happy New Year~!
d*f
8 楼
Under this stereographic projection the north pole itself is not associated
with any point in the complex plane. We perfect the one-to-one
correspondence by adding one more point to the complex plane – the so-
called point at infinity—and identifying it with the north pole on the
sphere. This topological space, the complex plane plus the point at infinity
, is known as the extended complex plane. We speak of a single "point at
infinity" when discussing complex analysis. There are two points at infinity
(positive, and negative) on the real number line, but there is only one
point at infinity (the north pole) in the extended complex plane.[6]
【在 W*****k 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 有学过复变的验证一下这个结论吗?
with any point in the complex plane. We perfect the one-to-one
correspondence by adding one more point to the complex plane – the so-
called point at infinity—and identifying it with the north pole on the
sphere. This topological space, the complex plane plus the point at infinity
, is known as the extended complex plane. We speak of a single "point at
infinity" when discussing complex analysis. There are two points at infinity
(positive, and negative) on the real number line, but there is only one
point at infinity (the north pole) in the extended complex plane.[6]
【在 W*****k 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 有学过复变的验证一下这个结论吗?
s*y
9 楼
我的妈呀 这粉鼻子粉小手~~~ 好想捏一个~~
w*u
11 楼
太乖了真是!
y*o
13 楼
妖媚的豆豆
y*u
15 楼
庆祝豆豆到家一周年!看你的签名还以为你养了豆豆6年了呢!
s*i
19 楼
哈,还会玩扑克
m*o
20 楼
赞粉嫩~~~好像亲一下~
p*f
21 楼
美豆,粉嫩的,可爱的,妖媚的。
i*i
22 楼
靓猫,赞
w*6
23 楼
一年过得真快。真高兴看到你们把豆豆照顾得这么好。不过应该狠狠心控制他的饮食,
太胖了容易生病的。
太胖了容易生病的。
t*i
24 楼
漂亮极了!
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