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 ...
8
votes
1answer
137 views

Why does the `&` reset grouping?

In this answer, I used \tikzmark to mark the extent of a typeset piece of text, so I could draw changebars next to it. But it initially seemed that the changebars "disappear" with math-mode content. ...
1
vote
1answer
286 views

How to avoid `&` conflict when using `\begin{align}` in a tabular cell?

Minimal CODE \documentclass{article} \usepackage {% array, calc, amsmath, longtable, varwidth% } \newsavebox\TBox \newcolumntype{B}[1] {% @{}% ...