master > master: minor Korrekturen ÜB 4-2(a), 4-2(c)
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@ -1352,6 +1352,7 @@
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\def\divides{\mathbin{\mid}}
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\def\ndivides{\mathbin{\nmid}}
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\def\ggT{\mathop{\text{\upshape ggT}}}
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\def\choose#1#2{\begin{smatrix}#1\\#2\\\end{smatrix}}
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\makeatother
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\begin{document}
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@ -3291,7 +3292,7 @@ für $a,b\in\intgr$.
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Sei $a\in \intgr$ beliebig.
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\textbf{Zu zeigen:} $a\sim a$.\\
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Offensichtlich gilt $\modfn(a,n)=\modfn(a,n)$.\\
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Per Konstruktion gilt also $(a,b)\sim(a,b)$.
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Per Konstruktion gilt also $a\sim a$.
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\item[\uwave{{\itshape Symmetrie:}}]
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Seien $a, a'\in \intgr$ beliebig.
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@ -3427,13 +3428,13 @@ für $a,b\in\intgr$.
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\,\text{per Definition}\\
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&= &\{a\in\intgr \mid \modfn(a,n)=\modfn(k,n)\}\\
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&= &\{a\in\intgr \mid \modfn(a,n)=k\}\\
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&= &\{a\in\intgr \mid \exists{q\in\intgr:~}a=qn+r\}\\
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&= &\{a\in\intgr \mid \exists{q\in\intgr:~}a=qn+k\}\\
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&= &\{qn+r \mid q\in\intgr\}\\
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&= &\intgr\cdot n + r.\\
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&= &\intgr\cdot n + k.\\
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\end{mathe}
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Also lassen sich die Äquivalenzklassen durch die Teilmengen
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${\{\intgr\cdot n+r\mid r\in\{0,1,\ldots,n-1\}\}}$
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${\{\intgr\cdot n+k\mid k\in\{0,1,\ldots,n-1\}\}}$
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darstellen.
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\end{enumerate}
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