SOLVED: Let H be a real Hilbert space and the countable orthonormal basis (en). Show that: (1) If T ∈ L(H) with T(en) = entl Then T is a compact operator. (2)
functional analysis - $T$ is self-adjoint on $L^2$ and $T^4$ is a compact operator, will $T$ be compact on $L^2?$ - Mathematics Stack Exchange
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A Class of -Dimensional Dirac Operators with a Variable Mass – topic of research paper in Mathematics. Download scholarly article PDF and read for free on CyberLeninka open science hub.
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