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\[ \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right) \]
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KOBV
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Die KOBV-Zentrale in Berlin-Dahlem.
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KOBV
()
Die KOBV-Zentrale in Berlin-Dahlem.
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