Hiun Kim (김희언) daily 📝
daily writings (일상 기록)May 19, 2025
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The Cauchy-Schwarz Inequality\
\(\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)\)