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Results tagged with vector-spaces
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user 53106
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Speed of convergence of vector expansions in non orthogonal basis
Suppose we have a finite-norm vector $X$ in a Hilbert space, and we want to construct its expansion in a certain (infinite) basis $V_k$, $X=\sum_k a_k V_k$. If the basis is orthonormal, then we know t …
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