- #1
Fellowroot
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Homework Statement
This is a problem from Haim Brezis's functional analysis book.
Homework Equations
The Attempt at a Solution
I'm assuming (e)n is the vectors like (e)1 = (1,0,0), (e)2=(0,1,0) and so on.
We know every hilbert space has an orthonormal basis.
I also need to know the difference between l^2 and L^2 spaces. I know that this might not be much of a solution, but I'm really stuck.
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