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问题 $\lrcorner$ 看起来太低了

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问题 $\lrcorner$ 看起来太低了

虽然我已经使用 Latex 很多年了，但我只了解最低限度的生存，不知道问题可能出在哪里。所以这里是加载的包。

\documentclass[10pt,a4paper,titlepage]{book}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}% math environment, e.g. \begin{align}
\usepackage{amsfonts} 
\usepackage{amssymb}
\usepackage{amsbsy}%  \boldsymbol in math
\usepackage[amsmath,amsthm,thmmarks]{ntheorem}% add \theoremsymbol{\ensuremath{\clubsuit}} to environment

http://tex.stackexchange.com/questions/20575/attractive-boxed-equations
\usepackage{multirow}% multiple rows tabular cells; 2nd Proof Volume of Bn within "bigde­lim; bigstrut" pack­ages
\usepackage{blkarray}% label rows and colums of a matrix; \begin{blockarray} and \begin{block}
\usepackage{graphics}  % \includegraphics{}
\usepackage[dvips]{graphicx}% provides options \includegraphics[scale=1]{file} 
\usepackage{rotating} % rotate sthg (grosse matrice jacobienne)
\usepackage{MnSymbol} % only \lcirclearrowdown arrow in commutative diagram, or \downspoon
\usepackage[all]{xy} % writing commutative diagrams
\usepackage{enumitem} % change the margin in \begin{itemize} and alike [leftmargin=1in]
\usepackage{bbm} % unit matrix \mathbbm{}
\usepackage{marvosym} % plus de symbol, symbols généraux non spécifiques aux maths. Contradiction \Lightning, @
\usepackage{comment} % allows to put whole parts as comment and not % line by line
\usepackage[usenames,dvipsnames]{xcolor} % [get more than the predefined 8 colors]

\usepackage{soul} % for highlighting. hyphenation, letter spacing, underline etc.
\newcommand{\hlc}[2][Yellow]{\sethlcolor{#1} \hl{#2}}

\usepackage{marginnote} % align comments in marge with some environment, allow use in eq. env.
\usepackage{cancel} % slash for gamma matrices
\usepackage[normalem]{ulem} % to do fancy underlying, [doesn't change \emph] , also useful when linebreak

\usepackage{tcolorbox} % also loads pgf, etoolbox, verbatim, environ packages; support boxes over multiple pages
\tcbuselibrary{breakable}  \tcbuselibrary{skins}  \tcbset{enhanced}

\usepackage{makeidx} % write \index{} 


\usepackage{fullpage} % extend broadth cf. also \usepackage[a4paper]{geometry}: set margins
\usepackage{tikz} % draw geometric figures, \begin{tikzpicture}; place after xcolor because conficts

\usepackage{titlesec} %  \chapter command; option: no page break after chapter with titleclass "straight" statt top
  \titleclass{\chapter}{top}
  \titleformat{\chapter}[display]
    {\normalfont\huge\bfseries}{}{0pt}{\Huge}
  \titlespacing*{\chapter}{0pt}{30pt}{25pt}

\usepackage{hyperref} % comme pour les equations, utilise \label et \hyperref[key]{text}
\hypersetup{
colorlinks,
citecolor=black,
filecolor=black,
linkcolor=blue,
urlcolor=black
} % no red framebox...

\theoremstyle{definition} % option de \newtheorem
\theoremsymbol{\ensuremath{\heartsuit}}
\newtheorem{definition}{Definition}[section]
\theoremsymbol{\ensuremath{\clubsuit}}
\newtheorem{lem}{Lemma}[section]
\newtheorem{coro}{Corollary}[section]
\newtheorem{prop}{Property}[section]
\newtheorem{propos}{Proposition}[section]
\newtheorem{thm}{Theorem}[section]

\setlength{\ULdepth}{\maxdimen}
%\addtolength{\ULdepth}{2pt}
\newenvironment{rem}{\vspace{0.5\baselineskip} \par \noindent\begin{color}{BlueViolet}\begin{small}\textit{\uline{Remark \thesection} :} \refstepcounter{section} }{\end{small}\end{color} \newline}% \newenvironment{name}{before text} text {after}
\newenvironment{rems}{\vspace{0.5\baselineskip}\par\noindent\begin{color}{BlueViolet}\begin{small}\textit{\uline{Remarks \thesection} :} \refstepcounter{section} \begin{enumerate}}{\end{enumerate}\end{small}\end{color}}

我已经看到如何获取内部产品/收缩符号$ \ lrcorner$，它在math.stackexchange中完美运行，但在我的乳胶文件中，该符号显得非常小并且位于线下方。

我已经尝试过$\mathrel{\lrcorner}$在另一个问题中看到${\big \lrcorner}$或几何代数，维基百科但没有效果。

答案1

罪魁祸首是MnSymbol包。如果您更喜欢\lrcornerfrom，amssymb则在加载包之前保存该值MnSymbol，然后重新分配它：

示例输出

\documentclass{book}

\usepackage{amssymb}
\let\amslrcorner\lrcorner
\usepackage{MnSymbol}
\let\lrcorner\amslrcorner

\begin{document}

\( x\lrcorner y \)

\end{document}

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