我在声明定理样式时遇到了问题。我希望定义的第一行位于新行上，并采用正常缩进。如果我尝试添加\par而不是\newlinefor postheadspace，则会出错。而且postheadhook似乎不起作用。
先感谢您 ：）
\documentclass[12pt,reqno]{amsbook}
\usepackage{thmtools}
\declaretheoremstyle[
headfont=\scshape\bfseries,
headindent = \parindent,
postheadhook = {\hspace{0mm}\newline},
postheadspace = \newline,
spaceabove = 0.5cm,
spacebelow = 0.5cm]{mydef}
\newtheorem{Theorem}{Theorem}[chapter]
\theoremstyle{mydef}
\newtheorem{Definition}[Theorem]{Definition}
\begin{document}
\begin{Definition}
This is a very long definition which i want to start with indent on the next row instead of from the beggining
Like this
\end{Definition}
\end{document}
答案1
为了正确应用样式，您需要使用\declaretheorem来定义结构，而不是\newtheorem。使用postheadhook = {\hspace*{\parindent}}您将获得所需的输出（我将结构保留Theorem为 ，\newtheorem因为显然它不应该具有mydef样式；如果您想将此样式应用于Theorem，请使用\declaretheorem；如果您不想要头部的缩进，请删除行headindent = \parindent）：
\documentclass[12pt,reqno]{amsbook}
\usepackage{thmtools}
\declaretheoremstyle[
headfont=\scshape\bfseries,
headindent = \parindent,
postheadhook = {\hspace*{\parindent}},
postheadspace = \newline,
spaceabove = 0.5cm,
spacebelow = 0.5cm]{mydef}
\newtheorem{Theorem}{Theorem}[chapter]
\declaretheorem[style=mydef,numberlike=Theorem]{Definition}
\begin{document}
\begin{Definition}
This is a very long definition which will start with indent on the next row instead of from the beginning.
Like this
\end{Definition}
\end{document}
