2

I'm basically needing some help in coding thisthis so that there is only one equation number. So far, I have produced this:

\begin{align}
 c_1(0) &= c_i, & c_1(L) &= c_e, \\
    c_2(0) &= c_i,      &    c_2(L) &= c_e, \\
    u(0) &= V,             &     u(L) &= 0.
\end{align}

Any help would be greatly appreciated!

  • 1
    Add \notag to the first and third line in your align environment. It will remove the tag of those two line. – Alain Remillard Feb 19 at 17:50
  • @AlainRemillard Thank-you! – Sas Feb 19 at 17:52
  • 9
    Instead of align, use equation with aligned as a sub-environment. (For displays with an even number of lines, this will center the equation number vertically.) – barbara beeton Feb 19 at 17:57
4

As already suggested by @barbarabeeton, you could use an aligned environment inside an equation environment. An additional suggestion: To obtain a bit more horizontal separation between the two groups of three equations, insert \qquad\qquad right before the middle & alignment marker in the first row.

enter image description here

\documentclass{article}
\usepackage{amsmath} % for 'aligned' environment
\counterwithin{equation}{section} % optional
\usepackage{newtxtext,newtxmath}  % optional -- Times Roman text and math font

\begin{document}
\setcounter{section}{3} % just for this query
\setcounter{equation}{21}
\begin{equation}
\begin{aligned}
 c_1(0) &= c_i, \qquad\qquad&  c_1(L) &= c_e, \\
 c_2(0) &= c_i,             &  c_2(L) &= c_e, \\
\phi(0) &= V,               & \phi(L) &= 0.
\end{aligned}
\end{equation}
\end{document}
  • @AboAmmar - Many thanks for the edit! – Mico Feb 19 at 22:05

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