Prove that there does not exists an estimator for which the risk is $0$.
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Proof that all Quotient Groups are Abelian where is my error?
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Cut points, continuous paths and increasing sequence of sets
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Elements of the coset G/H, where G=$GL^+$(2) and H=SO(2)
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Strassmann's thoerem and irrationality measure of certain number
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Difficult integral in statistical mechanics.
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