tikz and \: ????

hello

I've a problem with \:

ECM

\listfiles
\documentclass{article}
\usepackage{amsmath,tikz}
\begin{document}

$1\:2$

\end{document}


result:

./D1.tex:9: Use of \pgf@xifnch doesn't match its definition.
l.9 $1\:2
          $
If you say, e.g., `\def\a1{...}', then you must always
put `1' after `\a', since control sequence names are
made up of letters only. The macro here has not been
followed by the required stuff, so I'm ignoring it.

[1

{/Users/ego/Library/texmf/fonts/map/pdftex/updmap/pdftex.map}] (./ 
D1.aux)

*File List*
article.cls    2005/09/16 v1.4f Standard LaTeX document class
   size10.clo    2005/09/16 v1.4f Standard LaTeX file (size option)
     tikz.sty    2006/05/28 v1.01-cvs (rcs-revision 1.50)
      pgf.sty    2006/03/01 v1.01-cvs (rcs-revision 1.6)
   pgfrcs.sty    2005/11/28 v1.01-cvs (rcs-revision 1.9)
   pgfrcs.code.tex
pgfcore.sty    2005/10/25 v1.01-cvs (rcs-revision 1.3)
graphicx.sty    1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
   keyval.sty    1999/03/16 v1.13 key=value parser (DPC)
graphics.sty    2006/02/20 v1.0o Standard LaTeX Graphics (DPC,SPQR)
     trig.sty    1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg    2005/02/03 v1.3 graphics configuration of teTeX/TeXLive
   pdftex.def    2002/06/19 v0.03k graphics/color for pdftex
   pgfsys.sty    2006/04/19 v1.01-cvs (rcs-revision 1.14)
   pgfsys.code.tex
pgfsys-pdftex.def    2006/04/19 (rcs-revision 1.9)
pgfsyssoftpath.code.tex    2006/04/19 (rcs-revision 1.2)
pgfsysprotocol.code.tex    2006/04/19 (rcs-revision 1.2)
   xcolor.sty    2005/11/25 v2.08 LaTeX color extensions (UK)
    color.cfg    2005/02/03 v1.3 color configuration of teTeX/TeXLive
pgfcore.code.tex
pgfbaseshapes.sty    2006/06/27 v1.01-cvs (rcs-revision 1.11)
pgfbaseshapes.code.tex
pgfbaseplot.sty    2006/04/19 v1.01-cvs (rcs-revision 1.3)
pgfbaseplot.code.tex
pgfbaseimage.sty    2006/04/19 v1.01-cvs (rcs-revision 1.3)
pgfbaseimage.code.tex
pgfbaselayers.sty    2006/04/19 v1.01-cvs (rcs-revision 1.3)
pgfbaselayers.code.tex
pgfbasesnakes.sty    2006/04/19 v1.01-cvs (rcs-revision 1.7)
pgfbasesnakes.code.tex
pgfbasepatterns.sty    2006/04/19 v1.01-cvs (rcs-revision 1.6)
pgfbasepatterns.code.tex
pgfcomp-version-0-65.sty    2005/11/14 v1.01-cvs (rcs-revision 1.3)
     calc.sty    2005/08/06 v4.2 Infix arithmetic (KKT,FJ)
   pgffor.sty    2006/01/30 v1.01-cvs (rcs-revision 1.3)
   pgffor.code.tex
pgflibraryplothandlers.sty    2006/04/19 v1.01-cvs (rcs-revision 1.4)
pgflibraryplothandlers.code.tex
xkeyval.sty    2005/11/25 v2.5e package option processing (HA)
xkeyval.tex    2005/11/25 v2.5e key=value parser (HA)
     tikz.code.tex
supp-pdf.tex


Thanks Alain Matthes

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