thickness of \lfloor and \vert

Question

For some reason, I have to use both \lfloor and \left\vert in my latex file. But as the number of lines increase, it is clear that their thickness are not the same, which does not look nice to me :(

Here is the minimal working environment together with a screenshot of the output.

The \lfloor is clearly thicker than \vert.

My question: Is there a way to set the same thickness for both of them?

Any help is highly appreciated.

\documentclass[a4paper,11pt,fleqn]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
\begin{equation}
&\begin{array}{l}
\text{for}\;n=0,1,\ldots\\
\left\vert\left\lfloor
\begin{array}{l}
\text{for some reason, I have a mixture of
\texttt{lfloor} and \texttt{vert}}\\
\text{but their thickness are not the same}\\
\text{what are my options?}\\
\text{I would like the same thickness for both of them}
\end{array}
\right.
\end{array}
\end{equation}
\end{document}

Answer 1

mathabx does have a \thickvert extensible delimiter symbol. You probably do not want to use mathabx otherwise, so you need to follow those steps to only load this symbol. Then you can use \thickvert to get

\documentclass[a4paper,11pt,fleqn]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\DeclareFontFamily{U}{mathb}{\hyphenchar\font45}
\DeclareFontShape{U}{mathb}{m}{n}{
      <5> <6> <7> <8> <9> <10> gen * mathb
      <10.95> mathb10 <12> <14.4> <17.28> <20.74> <24.88> mathb12
      }{}
\DeclareSymbolFont{mathb}{U}{mathb}{m}{n}
\DeclareFontSubstitution{U}{mathb}{m}{n}
\DeclareFontFamily{U}{mathx}{\hyphenchar\font45}
\DeclareFontShape{U}{mathx}{m}{n}{
      <5> <6> <7> <8> <9> <10>
      <10.95> <12> <14.4> <17.28> <20.74> <24.88>
      mathx10
      }{}
\DeclareSymbolFont{mathx}{U}{mathx}{m}{n}
\DeclareFontSubstitution{U}{mathx}{m}{n}
\DeclareMathDelimiter{\thickvert}{0}{mathb}{"7E}{mathx}{"1F}
\begin{document}
\begin{equation}
\begin{array}{l}
\text{for}\;n=0,1,\ldots\\
\left\thickvert\left\lfloor
\begin{array}{l}
\text{for some reason, I have a mixture of
\texttt{lfloor} and \texttt{vert}}\\
\text{but their thickness are not the same}\\
\text{what are my options?}\\
\text{I would like the same thickness for both of them}
\end{array}
\right.\right.
\end{array}
\end{equation}
\end{document}

Answer 2

You can set the vertical rules using \vrule and add a little horizontal rule with \rule. Make sure to align the inner tabular at the [b]ottom.

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\[
  \begin{array}{ l }
    \text{for } n = 0, 1, \dots \\
    \hspace{.5em}% Space between left margin of tabular cell and first \vrule
    \vrule \hspace{.5em}% Vertical rule + space to next \vrule
    \vrule \rule[-.4em]{.5ex}{.4pt}% Vertical rule with little horizontal line
    \begin{tabular}[b]{ l }
      for some reason, I have a mixture of \texttt{lfloor} and \texttt{vert} \\
      but their thickness are not the same                                   \\
      what are my options?                                                   \\
      I would like the same thickness for both of them
    \end{tabular}
  \end{array}
\]

\end{document}