7.1 $B$N$H$-(B

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7.1 $u_{-}>u_{+}$ $B$N$H$-(B

$B$3$N$H$-$OFC@-6J@~$,8r$o$k!#(B

**$B?^(B 19:** $B8r:9$9$kFC@-6J@~(B
$\includegraphics[width=\textwidth]{image/charS2.eps}$

**$B?^(B 20:** $B>W7bGH2r$HFC@-6J@~(B
$\includegraphics[width=\textwidth]{image/charS3.eps}$

$B$h$C$F:81&$NCJ:9$NJ?6QCM$r;}$D>W7bGH(B

$\begin{displaymath} x=\frac{u_{-}+u_{+}}{2}t \end{displaymath}$

$B$K$h$C$F

$\begin{displaymath} u=\left\{\begin{array}{ll} u_{-} & (\displaystyle x<\frac{u... ...+} & (\displaystyle x>\frac{u_{-}+u_{+}}{2}t)\end{array}\right.\end{displaymath}$

$B$J$k4X?t$, $B$ODj?t$G!"Dj?t$O3N$+$KJ}(B $BDx<0(B (17) $B$rK~$?$7$F$$$k$+$i$G$"$k!#(B

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Shigeharu TAKENO
2001$BG/(B 9$B7n(B 21$BF|(B

7.1 $B$N$H$-(B

7.1 $u_{-}>u_{+}$ $B$N$H$-(B