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\(DX\)\(vs\) \(dx\)

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青青子衿 posted 2014-7-4 11:45 |Read mode
\(DX\)\(vs\) \(dx\)谁会赢?

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isee posted 2014-7-6 10:35
回复 1# 青青子衿


    大的不都占优么

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original poster 青青子衿 posted 2014-7-7 10:32
回复 2# isee
回复  青青子衿
    大的不都占优么
isee 发表于 2014-7-6 10:35
一个来自离散数学,一个来自连续数学。
从南边来了个大个,打北边来了小娃!

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其妙 posted 2014-7-7 22:10
尼玛不是方差和微积分么?

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original poster 青青子衿 posted 2014-7-8 11:27
回复 4# 其妙
\(DX\)为随机变量的方差,中学只指离散型随机变量的方差。
实际上连续型随机变量的方差也是用\(DX\)表示。
\(dx\)为自变量\(x\)的微分,\(D=\frac{d}{dx}\)为微分算子。

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其妙 posted 2014-7-10 20:00
回复 5# 青青子衿

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original poster 青青子衿 posted 2014-7-10 20:38
回复 6# 其妙
除微分算子以外,
你还知道哪些蒜子?

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其妙 posted 2014-7-12 20:39
回复  其妙
除微分算子以外,
你还知道哪些蒜子?
青青子衿 发表于 2014-7-10 20:38
尼玛 查一下《泛函分析》里多得是,几乎每一小节都离不开算子

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