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# Why study vector spacespaces of random variables having zero expectation?

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# Why doesthestudy vector space of random variables havehaving zero expectation?

Does this

Edit: Robin's comments appear to have anything made the matter a lot clearer to do with second-order stationary or some sort of homogeneous distribution of elements of me. I now suppose that the vector space ?

Alternatively, of random variables with zero expectation are there studied in the context of second order stationary processes.

The other question remains: are vector spaces of random variables with non-zero expectation also studied?

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