latex, problém vložit align* do tabulky

Ahoj, čekal, jsem, že latex bude bez problému umět zanořovat 'tagy' do sebe, ale narazil jsem:

Chci normálně do tabulky vložit prvky align. Nevím, proč to nejde. V čem by mohl být problém?

\documentclass[11pt]{article}
\usepackage{fontspec,amsmath,amssymb}
\usepackage[czech]{babel}
\newcommand{\dd}{\mathrm d}
\begin{document}

\begin{tabular}{ c  c}
\begin{align*}
1+2
\end{align*}
&
\begin{align*}
2+3
\end{align*}
\end{tabular}

\end{document}

mám tam fůru chyb:

! Missing \endgroup inserted.
<inserted text> 
                \endgroup 
l.10 \end{align*}
                 
! Missing } inserted.
<inserted text> 
                }
l.10 \end{align*}
                 
! Missing } inserted.
<inserted text> 
                }
l.10 \end{align*}
                 
! Missing \cr inserted.
<inserted text> 
                \cr 
l.10 \end{align*}
                 
! Missing { inserted.
<inserted text> 
                {
l.10 \end{align*}
                 

! LaTeX Error: \begin{tabular} on input line 7 ended by \end{align*}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.10 \end{align*}
                 
! Missing $ inserted.
<inserted text> 
                $
l.10 \end{align*}
                 
! Display math should end with $$.
<to be read again> 
                   \endgroup 
l.10 \end{align*}
                 
! Missing } inserted.
<inserted text> 
                }
l.10 \end{align*}
                 
! Missing $ inserted.
<inserted text> 
                $
l.10 \end{align*}
                 
! Missing } inserted.
<inserted text> 
                }
l.10 \end{align*}
                 
! Misplaced alignment tab character &.
l.11 &
      

Overfull \hbox (17.0pt too wide) in paragraph at lines 7--12
[][] 
! Misplaced \crcr.
\endtabular ->\crcr 
                    \egroup \egroup $\egroup 
l.15 \end{tabular}
                  
! Too many }'s.
\endtabular ->\crcr \egroup 
                            \egroup $\egroup 
l.15 \end{tabular}
                  
! Too many }'s.
\endtabular ->\crcr \egroup \egroup 
                                    $\egroup 
l.15 \end{tabular}
                  
! Extra }, or forgotten $.
<recently read> \egroup 
                        
l.15 \end{tabular}
                  

! LaTeX Error: \begin{document} ended by \end{tabular}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.15 \end{tabular}
                  
! Missing $ inserted.
<inserted text> 
                $
l.15 \end{tabular}
                  
! Extra \endgroup.
<recently read> \endgroup 
                          
l.15 \end{tabular}