If I recall correctly, in today's session someone asked about formatting typeset equations over multiple lines, where each line is aligned to the equals sign.
I tried looking for clear answers for a while and couldn't find anything that would apply to DisplayFormula or DisplayFormulaNumbered cells, assuming the goal is to just include typeset math in a notebook (and not just "computable" Input).
A first try was using an Input cell of the form:
where the two equations are entered via inline TeX input (control-4 on macOS). Of course, the result isn't just typeset math as text.
I did find a workaround by creating a DisplayFormula or DisplayFormulaNumbered cell, then using the math notation palettes or keyboard shortcuts to create a one-column, multiline "matrix/array" (without delimiters). I then entered one equation per line. For each equation, I positioned the cursor to just before the equals sign and entered "escape-a-m-escape" to enter alignment markers. After that, I showed the cell expression (shift-command-e on macOS) and modified the GridBoxAlignment option to "=", as shown below. This resulted in the numbered equation (2) shown in the screenshot image below.
Note: I duplicated the DisplayFormulaNumbered cell to include both views in the image above.
I would imagine that there's a much better way to do this type of multiline typesetting. So, I offer my less-than-great attempt in the hope that someone else has figured out a more elegant solution or may gain some inspiration to do so.
Cheers,
Dave
