\vec{A}\\
f'(x)\\
f''(x)\\
f^{(3)}(x)\\
f_{x}\\
f_{xy}\\
\frac{\partial f}{\partial y}\\
\frac{\partial^2 f}{\partial^2 y}\\
\frac{\partial}{\partial x} \left(\frac{\partial z}{\partial y}\right)\\
\frac{\partial}{\partial x} (\frac{\partial z}{\partial y})\\
\Delta = \nabla^2 = \frac{\partial^2 f}{\partial x^2} + \frac{\partial^2 f}{\partial y^2}\\
\vec{a} = (a_1, a_2, \cdots, a_n)\\
\boldsymbol{A}\\
\vec{a} \perp \vec{a}\\
\vec{a} \parallel \vec{a}\\
{}^t\boldsymbol{A}\\
\boldsymbol{a} \cdot \boldsymbol{b}\\
\boldsymbol{a} \times \boldsymbol{b}\\
\boldsymbol{a} \otimes \boldsymbol{b}\\
