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假设有向量 \vec {a}= (a_1,a_2,.,a_n), \vec {b}= (b_1,b_2,.,b_n) , 它们的点乘有 \boxed {\vec {a}\cdot\vec {b}}=a_1 b_1+a_2 b_2+.+a_n b_n\\\equiv \boxed {|\vec {a}||\vec.
Appendix linked to toxic Parkinson's protein National Institutes of
