# Dot's in center of a matrix?

I'm trying to put vertical dots into a matrix, and I can only get it to align with one of the elements - as shown in:

    $$\begin{pmatrix} 1 & -1 & 0 & 0 & \hdots & 0\\ 0 & 1 & -1 & 0 & \hdots & 0\\ & & & \vdots & \\ 0 & \hdots & 1 & -1 & 0 & 0 \end{pmatrix}$$


I was wondering if there was a way to centering the dots? I reviewed "Centering \vdots in a sparse matrix with an even number of rows" but unfortunately couldn't implement the solution.

Any help would be much appreciated.

• Whare would you like to have them? Unrelated: don't use $$…$$ for displayed equations: it is plain TeX syntax and can lead to bad vertical spacing. – Bernard Apr 23 '17 at 22:27
• Hi Bernard! Ideally, I would have them in the middle of the third line - is there a way to do this without introducing more terms to the matrix? Thanks for the tip. – лаетековский чайник Apr 23 '17 at 22:31
• You mean\vdots? – Bernard Apr 23 '17 at 22:39
• That's right, I don't have a strong preference, it's just that's the syntax I have seen. – лаетековский чайник Apr 23 '17 at 22:43

\documentclass[margin=3mm,preview]{standalone}
$\begin{pmatrix} 1 & -1 & 0 & 0 & \dotsm & 0\\ 0 & 1 & -1 & 0 & \dotsm & 0\\ \multicolumn{6}{c}{\vdots} \\ 0 & \dotsm & 1 & -1 & 0 & 0 \end{pmatrix}$