我不知道如何解决这个问题，我尝试找到一些旧资源，但谷歌搜索大多会给出其他文档类别的提示，而且经常从章节变为文章或类似内容。这是序言和等式
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%Information to be included in the title page:
\begin{document}
\begin{frame}{}
Let $\Omega \subset \mathbb{C}$ be open, connected and containing the origin. We assume that the function $\Phi:\Omega\to\C$ is analytic in $\Omega$ with $\Phi(0) = 0$, Re$\Phi'(0) > 0$. \pause
\begin{definition}
We say that $\Omega$ is {\bf $\Phi$-like}
if \ $\forall \alpha \in \Omega$ the initial value problem
\begin{equation}\label{Eq1}
\begin{cases}
\frac{dw}{dt} = -\Phi(w)\\
w(0) = \alpha
\end{cases}\,.
\end{equation}
has a solution $w$ defined on $[0,\infty)$ with\\ (i) $w(t) \in \Omega,~t\ge 0$,\\ (ii) $\lim_{t\to\infty}w(t)= 0$.
\end{definition}
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