How can I create a newcommand (for latex preamble, using lyx) which its arguments are more than one character?

Specifically, I'm trying to create myself a shortcut for the Rank–nullity theorem and tried to set the following latex preamble I wrote: (I've set \Ima command to Im text)


It works fine if every argument is only one character: \dimthm VT will produce:

dim V = dim Im T + dim ker T

But if for example my transformation is LALA I won't be able to get

dim V = dim Im LALA + dim ker LALA

Is it possible?

I've saw a few similar question over here, but couldn't make any solution work.

  • You know that you should use \dimthm{VT} then? Otherwise TeX/LaTeX just reads the V and ignores the T as macro argument to \dimthm
    – user31729
    Mar 24, 2017 at 17:16
  • Oh you're right, I just automatically wrote it as I use the command in Lyx editor. Mar 24, 2017 at 17:21
  • which proves that such editors LyX lead to lazyness ;-)
    – user31729
    Mar 24, 2017 at 17:24
  • Which editor do you recommend? I just started with LyX since I heard of it and I was short in time to learn and needed to start quickly Mar 24, 2017 at 17:28
  • I don't recommend those editors at all. Use vi or emacs or notepad etc.
    – user31729
    Mar 24, 2017 at 17:32

1 Answer 1


Grouping with braces should help. In this way, V is the first argument and LALA is the second. However, one must remember that something like LALA will typeset as four consecutive math variables L, A, L, A.

$\dimthm VT$

$\dimthm V{LALA}$

$\dimthm {Howdy}{Ho}$

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