Wrong numeration using \newtheorem

Question

by using the \newtheorem, the latex does not number the theorems in the right order.

used code is

\newtheorem{theo.a}{Proposition} \begin{theo.a} this is the proposition. \end{theo.a}

changing into

\newtheorem{theo.a}{Proposition}[2] \begin{theo.a} this is the proposition. \end{theo.a}

leads to a wrong output as well (Proposition 1 is replaced by Proposition .1)

output

What exactly are you trying to do here? There is no counter called 2 any ways. — daleif
– daleif, Commented Apr 3, 2014 at 12:13
You are aware that using theo.a a second time, it will print Proposition 2?!? Numbers are automatic. — daleif
– daleif, Commented Apr 3, 2014 at 12:23
Your are right. I forgot to say, that I don't use them in the right order. (first prop 2, then prop 1) My fault.. — user49042
– user49042, Commented Apr 3, 2014 at 12:30

David Carlisle · Accepted Answer · 2014-04-03 15:36:04Z

Please always post complete small documents, not unusable fragments however like most latex counter constructs,

\newtheorem{theo.a}{Proposition}

defines theo.a to increment the counter before printing it so if you want to start at Proposition 42 then you just need

\setcounter{theo.a}{41} \begin{theo.a} this is the proposition. \end{theo.a}

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