# How to put periods between a set of equations?

Is there a better way to put points between a set of equations as follow:

$$\begin{split} &y_1=y_0+hf_0\\ &y_2=y_0+2hf_1\\ .\\ .\\ .\\ &y_n=y_{n-1}+2hf_{n-1} \end{split} \label{eq: stoer method 2}$$

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A quick comment, not related directly to your question but to the use of the & alignment points in a split environment: It's preferable to align the rows on a common element such as = instead of on the first character of each row. While the widths of y_1, y_2, and y_n happen to be fairly similar, the appearance of the system of equations risks becoming marred if you also have entries such as y_[m-1} to the left of the = symbol. –  Mico Jun 24 '14 at 8:57

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$$\begin{split} &y_1=y_0+hf_0\\ &y_2=y_0+2hf_1\\ &\vdots\\ &y_n=y_{n-1}+2hf_{n-1} \end{split} \label{eq: stoer method 2}$$

But rather

$$\begin{array}{l} y_1=y_0+hf_0\\ y_2=y_0+2hf_1\\ \multicolumn{1}{c}{\vdots}\\ y_n=y_{n-1}+2hf_{n-1} \end{array}$$

\end{document}


Certainly, the position of vertical dots can be changed.

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The mathtools package offers the macros \vdotswithin and \shortvdotswithin for just this purpose.

\documentclass{article}
\usepackage{mathtools}
\usepackage{lmodern}
\setlength\textwidth{3in} % just for this example
\begin{document}
$$\begin{split} y_1&=y_0+hf_0\\ y_2&=y_0+2hf_1\\ &\vdotswithin{=}\\ %% note the "\\" row terminator y_m&=y_{m-1}+2hf_{m-1}\\ \shortvdotswithin{=} %% note: no row terminator y_n&=y_{n-1}+2hf_{n-1} \end{split} \label{eq: stoer method 2}$$
\end{document}

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Thanks. that works as well –  Maryam Jun 24 '14 at 20:57

Try

$$\begin{split} &y_1=y_0+hf_0\\ &y_2=y_0+2hf_1\\ \vdots\\ &y_n=y_{n-1}+2hf_{n-1} \end{split} \label{eq: stoer method 2}$$


Related question about the alignment of the vertical dots that you might want to look into: Centering \vdots in a system of many equations

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Thanks. it works –  Maryam Jun 24 '14 at 20:56