33
votes
4answers
2k views

What does a double ampersand (&&) mean in LaTeX?

I've seen several answers that use the double ampersand, but I can't figure out exactly what it does. I tried this out: \begin{align*} \frac{3x + y}{7} &= 9 & \text{given} \\ 3x + y ...
1
vote
1answer
179 views

Two columns of equations, aligned and just one number per column

I'm writing a two-column document, and I want to display two sets of large equations floating at the top. Each equation set should be aligned within the same column, and only the two top equations ...
4
votes
2answers
490 views

Varying number of columns in multi-equation environment

Consider the following document: \documentclass{article} \usepackage{amsmath} \newcommand{\expr}[1]{\begin{pmatrix}x_#1\\y_#1\end{pmatrix}} \begin{document} \begin{equation} c = a \cdot b ...
6
votes
3answers
578 views

Suggestions for splitting a large fractional equation?

I have seen a number of questions detailing specific means for how to break down a given equation, however I am more interested in the design at this point. That is, I'm not sure what part of this ...
0
votes
0answers
381 views

Multi-column formulas using align [duplicate]

Possible Duplicate: Two column align environment with one line spanning both columns I am new to the amsmath package, and I am using alignat to write a long proof, composed of a number of ...