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I want to write the above equation I tried 

\begin{align} d(0,0) &= e(0,0) \\ d(0,j) &= e(0,j) + d(0,j-1) \text{$j = 1,2,..., N_\tau -1$}\\ d(i,0) &= e(i,0) \text{$i = 1,2,..., N_t -1$}\\ d(1,j) &= e(1,j) + \begin{cases} d(0,j) \\ d(0,j-1) & \text{$j = 1,2,..., N_\tau -1$}\\ d(1,j-1)) \end{cases} \\ d(i,1) &= e(i,1) + \begin{cases} d(i,0)\\ d(i-1,0) & \text{$i = 1,2,..., N_t -1$}\\ d(i-1,1)) \end{cases} \\ d(i,j) &= e(i,j) + \begin{cases} d(i-1,j-1)\\ d(i-1,j-2) + e(i,j-1) & \text{$ i > 1$ and $j > 1$}\\ d(i-2, j-1) + e(i-1,j) \end{cases} \end{align}

but I didn't work ... I want a multi line equation with labeling

THank you

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  • Welcome. Apart from the fact that you are using blank lines, which are not allowed ... I don't understand the problem. Commented Jun 12, 2016 at 14:42

4 Answers 4

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See, if the following result ids what you looking for:

enter image description here

\documentclass{article} \usepackage{mathtools} \usepackage{geometry} \begin{document} \begin{align} d(0,0) & = e(0,0) \\ d(0,j) & = e(0,j) + d(0,j-1);\quad j = 1,2,\dots, N_\tau -1 \\ d(i,0) & = e(i,0) ;\quad i = 1,2,\dots, N_t -1 \\ % d(1,j) & = e(1,j) + \begin{cases} d(0,j) & \\ d(0,j-1) & j = 1,2,\dots, N_\tau -1 \\ d(1,j-1)) & \end{cases} \\ d(i,1) & = e(i,1) + \begin{cases} d(i,0) & \\ d(i-1,0) & i = 1,2,\dots, N_t -1 \\ d(i-1,1)) & \end{cases} \\ d(i,j) & = e(i,j) + \begin{cases} d(i-1,j-1) & \\ d(i-1,j-2) + e(i,j-1) & i > 1 \text{ and } j > 1 \\ d(i-2, j-1) + e(i-1,j) & \end{cases} \end{align} \end{document}

Your MWE is unnecessary complicated, but in the same time there are missing ampersands and as say johannes-b in his comments, not allowed empty lines ...

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  • Would you mind changing the dots to \dots? Commented Jun 12, 2016 at 14:50
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Usage of \nonumber before \\ produce the output what you are seeking:

\documentclass{article} \usepackage{mathtools} \usepackage{geometry} \begin{document} \begin{align} d(0,0) & = e(0,0) \nonumber\\ d(0,j) & = e(0,j) + d(0,j-1);\quad j = 1,2,\dots, N_\tau -1 \nonumber\\ d(i,0) & = e(i,0) ;\quad i = 1,2,\dots, N_t -1 \nonumber\\ % d(1,j) & = e(1,j) + \begin{cases} d(0,j) & \\ d(0,j-1) & j = 1,2,\dots, N_\tau -1 \\ d(1,j-1)) & \end{cases} \nonumber\\ d(i,1) & = e(i,1) + \begin{cases} d(i,0) & \\ d(i-1,0) & i = 1,2,\dots, N_t -1 \\ d(i-1,1)) & \end{cases} \nonumber\\ d(i,j) & = e(i,j) + \begin{cases} d(i-1,j-1) & \\ d(i-1,j-2) + e(i,j-1) & i > 1 \text{ and } j > 1 \\ d(i-2, j-1) + e(i-1,j) & \end{cases} \end{align} \end{document}
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\documentclass{article} \usepackage{mathtools} \begin{document} \begin{align} \begin{aligned} d(0,0) & = e(0,0) \\ d(0,j) & = e(0,j) + d(0,j-1);\quad j = 1,2,\dots, N_\tau -1\\ d(i,0) & = e(i,0) ;\quad i = 1,2,\dots, N_t -1 \\ % d(1,j) & = e(1,j) + \begin{cases} d(0,j) & \\ d(0,j-1) & j = 1,2,\dots, N_\tau -1 \\ d(1,j-1)) & \end{cases} \\ d(i,1) & = e(i,1) + \begin{cases} d(i,0) & \\ d(i-1,0) & i = 1,2,\dots, N_t -1 \\ d(i-1,1)) & \end{cases} \\ d(i,j) & = e(i,j) + \begin{cases} d(i-1,j-1) & \\ d(i-1,j-2) + e(i,j-1) & i > 1 \text{ and } j > 1 \\ d(i-2, j-1) + e(i-1,j) & \end{cases} \end{aligned} \end{align} \end{document}

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For every line where you do not want a number add a \nonumber before the \\. It should remove the numbers.

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