1. 引理

\newtheorem{lemma}{Lemma}[section]
\begin{lemma} \label{lemma1}\end{lemma}

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2. 定理

\newtheorem{thm}{\bf Theorem}[section]
\begin{thm}\label{thm1}
Suppose system (\ref{l1}) satisfies Assumption (\ref{mim1}), the closed-loop system consisting of
system (\ref{l1}), the disturbance observer (\ref{g1}) and the proposed controller (\ref{n3}) is semi-globally ISS.
\end{thm} 

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3. 证明

\begin{proof}
***
\end{proof}

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4. 假设

\newtheorem{assumption}{Assumption}[section]
\begin{assumption}
***
\end{assumption}

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5. tex中实现空白行

\viskp\baselineskip 
\viskp\baselineskip 
\viskp\baselineskip 

编译效果：空出三行的距离

原文链接：https://blog.csdn.net/miracle_fans/article/details/78255650