I'm currently using

\newtheorem{lemma}[abc]{Lemma A.}

but the spacing is off. abc is just a counter here. Can I instead have the A. be part of the enumeration? Or is there a way to remove the space after "Lemma A."? The enumeration should just be A.1, A.2, A.3 and so on, the letter A never changes.


Redefine the abc counter representation to always be preceded by A.:

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Also see Lemma~\ref{lem:third}.
  First lemma.

  Second lemma.

  Third lemma.\label{lem:third}


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