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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.
4
votes
2
answers
4k
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Proof of Young's convolutions inequality for a general measure on $\mathbb R^d$
Is Young's inequality true for an arbitrary measure on $\mathbb R^d$? If so, where can I find a proof of it? In particular, where can I find the proof of the discrete version (i.e the version for $ …
10
votes
5
answers
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What is a rigorous statement for "linear time-invariant systems can be represented as convol...
In Signal Processing books, a fundamental theorem is that linear time invariant systems can be represented as a convolution with a distribution. Could you give a mathematically rigorous statement of …