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Does anyone know how to make a subscript on the left hand side in LyX in a formula?

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In LaTeX, without using any additional package, you could use

${}_x F_x$

to write xFx. Using this as the baseline approach, inside a math formula, insert a subscript to "nothing", followed by the "middle symbol", followed by another subscript.

enter image description here

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  • This is not very good, since if you have something before the first "_{x}", e.g. A _{x}F_{x} then it would be typeset as if you have a subscript for A – Ur Ya'ar May 22 '18 at 11:54
  • @UrYa'ar: There are ways around that. Do you have any suggestions? Perhaps not using LyX? ;) – Werner May 22 '18 at 19:22
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    One way it to put a {} before. Another is to implement \prescript in a macro, I gave a detailed answer below. – Ur Ya'ar Jul 12 '18 at 8:32
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The mathtools package defines \prescripts which is supposed to give the right spacing for left super/sub-scripts.The syntax of the command is \prescript{<sup>}{<sub>}{<arg>}. To implement it in LyX one should define a macro as follows: enter image description here To get it, on the "TeX" box you write the following string (don't copy-paste as it won't work. While typing the script LyX will change e.g. \{ into the correct form of {})

 \prescript\{\#1 \{\#2 \{\#3

and in order for it to preview nicely, write in the "LyX" box

^\#1 _\#2 \#3

of course you can skip either the sup or sub script argument, but you still need to have an empty '{}' for it, e.g

enter image description here

Note that if you get a compilation error you need to tell LyX to load mathtools via Document->Settings->Math options.

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