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I'm trying to create a document that follows a numbering system of:
1. 1.a 1.a.1 1.a.2 1.b etc
I've tried to use the commands below to specify which section/subsection should be labelled with arabic and which should be labelled with a value. However it's not worked, and I suspect either I am missing a command needed to combine the two labelling types, or that it cannot be done!
\value{section}
\arabic{subsection}
\value{subsubsection}
\value returns an internal register counter suitable for TeX arithmetic and numeric tests, it does not return tokens that may be directly typeset, you want \arabic for that.
I think you want:
\renewcommand{\thesection}{\arabic{section}}
\renewcommand{\thesubsection}{\thesection.\alph{subsection}}
\renewcommand{\thesubsubsection}{\thesubsection.\arabic{subsubsection}}
