I tried $f’(x)$ but it wouldn't show the ’. Should I install a package or is there a specific command for this?
[Tex/LaTex] How to write f′ (x) with a prime
math-modesymbols
Related Solutions
The result is really ugly:
\documentclass{article}
\usepackage{graphicx,amssymb}
\newcommand{\vin}{\rotatebox[origin=c]{-90}{$\in$}}
\begin{document}
\[
\begin{array}{@{}c@{\;}c@{\;}c@{\;}c@{\;}c@{}}
x & \cdot & W_{1,2} & = & o \\
\vin && \vin && \vin \\
\mathbb{R}^{1\times n} && \mathbb{R}^{n\times m} && \mathbb{R}^{1\times m}
\end{array}
\]
\end{document}
I'd simply avoid such visual description in print; I often use something like that on the blackboard, but it's a completely different situation. I'd prefer something like
\[
x\cdot W_{1,2} = o
\]
where $x\in\mathbb{R}^{1\times n}$ and $W_{1,2}\in\mathbb{R}^{n\times m}$.
in a printed document.
The following will work nicely:
\documentclass{article}
\usepackage{amsmath}
\usepackage{mathtools}
\DeclareMathOperator{\Hessian}{Hess}
\begin{document}
\begin{align}
(\Hessian f)_{ij} &\equiv \frac{\partial^{2} f}{\partial x_{i} \partial x_{j} } \\
\Hessian\left( \frac{x^{2}}{y} \right) &=
\begin{bmatrix}
\frac{2}{y} & - \frac{2x}{y^{2}} \\
-\frac{2x}{y^{2}} & \frac{2x^{2}}{y^{3}}
\end{bmatrix}
\end{align}
\end{document}
Best Answer
Type
$f' (x)$or$f^{\prime}(x)$.