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→On Banach spaces: I dared to make change described in talk page. Could be wrong. |
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Line 8:
:<math>\mathcal{L}:\mathcal{H} \to \mathcal{H}</math>
is [[compact operator|compact]]
:<math>\mathcal{L} = \sum_{n=1}^N \rho_n \langle f_n, \cdot \rangle g_n</math>
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