7

MWE

\documentclass{article}
\usepackage{mathtools}

\begin{document}
Le signe $(-1)^{i+j}$ suit un motif en damier :
\(
\begin{bsmallmatrix}
+ & - & + & - & \cdots \\
- & + & - & + & \cdots \\
+ & - & + & - & \cdots \\
- & + & - & + & \cdots \\
\vdots & \vdots & \vdots & \vdots & \ddots
\end{bsmallmatrix}
\)
\end{document}

enter image description here

Questions

  1. There appears to be some horizontal empty space around the matrix. How can I remove or reduce it?

  2. It seems that \cdots is not as bold as \vdots and \ddots. Is this actually the case? If so, is there a way to make the various dots visually consistent?

THANKS A LOT!

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2
  • I know that one can reduce the space using vspace. But I ask about a less manual solution. Commented Feb 24 at 17:20
  • 1
    Does tex.stackexchange.com/a/573001/4427 help? Commented Feb 24 at 17:27

2 Answers 2

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6

Maybe you could consider loading also the package unicode-math

Example

\documentclass{article}

\usepackage{mathtools}
\usepackage{unicode-math}

\begin{document}
Le signe $(-1)^{i+j}$ suit un motif en damier :
\(
\begin{bsmallmatrix}
+ & - & + & - & \cdots \\
- & + & - & + & \cdots \\
+ & - & + & - & \cdots \\
- & + & - & + & \cdots \\
\vdots & \vdots & \vdots & \vdots & \ddots
\end{bsmallmatrix}
\)
\end{document}
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3

You can use “scalable” dots.

\documentclass{article}
\usepackage{mathtools}

\makeatletter
\NewDocumentCommand{\svdots}{}{\mathord{\text{\svdots@}}}
\newcommand{\svdots@}{%
  \sbox\z@{$X$}%
  $\vcenter to \ht\z@{\hbox{.}\vss\hbox{.}\vss\hbox{.}}$}
\NewDocumentCommand{\sddots}{}{\mathord{\text{\sddots@}}}
\newcommand{\sddots@}{%
  \sbox\z@{$X$}\sbox\tw@{$\mskip-\medmuskip\cdots\mskip-\medmuskip$}%
  $\;\vcenter to \ht\z@{
    \hbox to\wd\tw@{.\hss}\vss
    \hbox to\wd\tw@{\hss.\hss}\vss
    \hbox to\wd\tw@{\hss.}}\;$%
}
\makeatother

\begin{document}

$\begin{bsmallmatrix}
+ & - & + & - & \cdots \\
- & + & - & + & \cdots \\
+ & - & + & - & \cdots \\
- & + & - & + & \cdots \\
\svdots & \svdots & \svdots & \svdots & \sddots
\end{bsmallmatrix}
$

\end{document}

output

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