Is it possible to set the environment in such a way that sections are indexed with numbers, and subsections with both numbers and letters? For example,

1 First section

1.1 First subsection

1.2 Second subsection

1.A first letter subsection

1.B second letter subsection


  • 1
    And what about the next subsection? Are there, in the same section, some subsections with numbers followed by some with letters? Or are they intermixed?
    – egreg
    Feb 12, 2023 at 16:51
  • I think that's pretty easy to do with Denis's answer cause you can just use \renewcommand{\thesubsection}{\arabic{section}.\Alph{subsection}} replace \Alph and \arabic as you see fit
    – Math_Day
    Feb 13, 2023 at 18:16

1 Answer 1


Yes, of course. Quick and dirty, try:

\section{First section}
\subsection{First subsection}
\subsection{Second subsection}

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  • 1
    Of course at some point you might have to go back to the original "indexing" scheme, perhaps for a subsections within a later section. Feb 12, 2023 at 18:52
  • @PeterWilson Sure. This why I said it was quick and dirty
    – Denis
    Feb 13, 2023 at 8:12

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