摘要：Vector Fields Vector Function F(x,y,...)=P(x,y)i + Q(x,y)j + ... = F=Pi + Qj + ... |F(x,y,...)| = \sqrt {(x^2) + (y^2) + ...} Scalar Function F(x,y,.. 阅读全文

摘要：equation systems: \begin{equation } 1 + 2 = 3 \\ 1 = 3 2 \end{equation } align text \begin{align} 1+2 &= 3\newline f(x) &= x^2\\ g(x) &= \frac{1}{x}\\ 阅读全文