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The parcolumns package seems to work perfectly for what I want, thank you for the suggestion!

Let me add that I have also tried the parallel package for this purpose, and it works very well except for the poor behavior of some things which appear inside the parallel text, for instance, \begin{enumerate} produces an enumerated list which spans both columns, when I want to have a separate ...

Hi, I am having problems setting up a LaTeX document which is single-column by default but in which I sometimes switch into a two-column format, and where I want to have the text in the left column line up very well with the text in the right column (certain algebraic theorems are in the left column ...