rovnice na vice radku

[Viktor Patras]

Vazeni pratele,
mam MikTeXovskou instalaci na WinNT podle navodu ze stranek 
CsTUGu a snazim se psat v LaTeXu matematickou rovnici

\begin{eqnarray}
\mathrm{maximalizovat} \quad
f(y^{i},z^{i}) & = & g_{i} \\
\mathrm{za \ podmínky} \quad
- \sum_{j \in J_{i}} a_{jk}^{i} y_{j}^{i} + g_{i} & \leq & 0; j=j_{i}, 
k=k_{i} \nonumber \\
\sum_{j \in J_{i}} y_{j}^{i} & = & 1 \nonumber \\
y_{j}^{i} & \geq & 0 \nonumber
\end{eqnarray}

Bohuzel mi to pri zpracovani neustale hlasi nasledujici chyby, ktere 
se teda po odentrovani nejak zpracuji, ze vysledek se zobrazi 
spravne. Presto si myslim ze to neni normalni a zajimalo by me, v 
cem je ta chyba, na kterou uz asi 2 dny nemohu prijit? Jedine co 
jsem zjistil je to, ze za to nejak muze ten \mathrm, ale proc? 
Prosim poradte.


LaTeX Warning: Command \' invalid in math mode on input line 229.

! Please use \mathaccent for accents in math mode.
\add at accent ...ctor \spacefactor }\accent 
                                          #1 #2\egroup \spacefactor \...
l.229 \mathrm{za \ podmínky}
                             \quad
? 
! Missing { inserted.
<to be read again> 
                   \begingroup 
l.229 \mathrm{za \ podmínky}
                             \quad
? 

LaTeX Warning: Command \i invalid in math mode on input line 229.

! You can't use `\spacefactor' in math mode.
\add at accent ... #1 #2\egroup \spacefactor 
                                          \accent at spacefactor 
l.229 \mathrm{za \ podmínky}
                             \quad
? 
! Missing } inserted.
<inserted text> 
                }
l.230 ...}} a_{jk}^{i} y_{j}^{i} + g_{i} &
                                           \leq & 0; j=j_{i}, k=k_{i}...
? 
Missing character: There is no c in font cmex10!


S pozdravem


Viktor Patras