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\begin{enumerate}[label=(\roman*)]
	\item Identität: $\phi(0,x)=x$ $\forall$ $x$ $\in$ $X.$
	\item Halbgruppen Eigenschaft: $\phi(s+t,x)=\phi(t,\phi(s,x))$ $\forall$ $x$ $\in$ $X$ und $\forall$ $s,$ $t$ $\in$ $T.$
\end{enumerate}

...
(C:\Users\7615\Desktop\Proseminar\Bachelorseminar\einführung.tex
LaTeX Font Info:    Try loading font information for OT1+lmr on input line 4.

("C:\Program Files\MiKTeX 2.8\tex\latex\lm\ot1lmr.fd"
File: ot1lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
)
LaTeX Font Info:    Try loading font information for OML+lmm on input line 4.

("C:\Program Files\MiKTeX 2.8\tex\latex\lm\omllmm.fd"
File: omllmm.fd 2009/10/30 v1.6 Font defs for Latin Modern
)
LaTeX Font Info:    Try loading font information for OMS+lmsy on input line 4.

("C:\Program Files\MiKTeX 2.8\tex\latex\lm\omslmsy.fd"
File: omslmsy.fd 2009/10/30 v1.6 Font defs for Latin Modern
)
LaTeX Font Info:    Try loading font information for OMX+lmex on input line 4.

("C:\Program Files\MiKTeX 2.8\tex\latex\lm\omxlmex.fd"
File: omxlmex.fd 2009/10/30 v1.6 Font defs for Latin Modern
)
LaTeX Font Info:    External font `lmex10' loaded for size
(Font)              <12> on input line 4.
LaTeX Font Info:    External font `lmex10' loaded for size
(Font)              <8> on input line 4.
LaTeX Font Info:    External font `lmex10' loaded for size
(Font)              <6> on input line 4.

! Missing number, treated as zero.
<to be read again> 
                   \c@* 
l.5 \begin{enumerate}[label=(\roman*
                                    )]
? 
! Emergency stop.
<to be read again> 
                   \c@* 
l.5 \begin{enumerate}[label=(\roman*
                                    )]
End of file on the terminal!

 
Here is how much of TeX's memory you used:
 1336 strings out of 495286
 16602 string characters out of 3180369
 63567 words of memory out of 3000000
 4549 multiletter control sequences out of 15000+200000
 43586 words of font info for 35 fonts, out of 3000000 for 9000
 14 hyphenation exceptions out of 8191
 24i,5n,24p,295b,238s stack positions out of 5000i,500n,10000p,200000b,50000s
Output written on Bachelorarbeit.dvi (3 pages, 1288 bytes).

\usepackage{enumitem}