标签方程式不适用于文档类别报告

Question

Hi I am using the class report ( my University wants me to use it ) , but I cannot label any equation . An except of my code :

\documentclass[12pt,a4paper]{report}
\usepackage{graphicx}
\graphicspath{ {Home/} }
\usepackage{newlfont}
\usepackage{color}
\usepackage{mathtools} 
\usepackage{amsmath}
\usepackage{cool}
\usepackage{esdiff}
\begin{document}
\begin{document}
\begin{equation} \label{eq:1}
x(t+\Delta) = x(to) + \int_{to}^{to+\Delta} f(x,t) dt 
\end{equation}
\end{document}

Answer 1

What are you calling label? With your code, the equation will be correctly numbered with (1) at the end.

If you want to call it later in the code, add for example

considering Eq.~(\ref{eq:1}) blablabla