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0x 0y = с.

0x (@0xProject) | Твиттер

Последние твиты от 0x (@0xProject). Decentralized exchange infrastructure for the internet. San Francisco, CA...

discrete mathematics - Can the expected value of a PMF be zero, as in...

$X$ and $-X$ have the same distribution (by definition $X$ is symmetric) so that $\mathbb E(-X)=\mathbb EX$. This can used as follows: $0=X (-X)\Rightarrow 0=\mathbb E(X (-X))= \mathbb EX \mathbb E(-X)= 2\times\mathbb EX$ hence $\mathbb EX=0$. In general if $X$ is symmetric and...


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