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In article <50ja0p$pqo@ces.ces.kyutech.ac.jp>
zhang@ces.ces.kyutech.ac.jp (Hong Zhang) writes:
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> $B9TNs(B)$BB2$rG!2?$K5a$a$k$+$H$N$3$H$G$9!#$?$@$7!"&6$H&"$O%Y%/%H%k!"&Q(B
> $B$OJQ?t$G!"$7$+$b&Q(B>=0$B$G$9!#(B

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X $B$ND9$5$O(B 1$B$G$"$k$H$7$^$7$g$&(B.

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$B>e$NJ}Dx<0$O(B P A X = \rho P B $B$HF1CM$G$9(B.
$B99$K=q$-D>$9$H(B, P A P^* P X = P A P^* e_1 = \rho (a e_1 + b e_2)
$B$H$J$j$^$9(B. $B$3$3$G(B  P A P^* = C $B$H$9$l$P(B  A = P^* C P $B$G$"$j(B,

 C e_1 = \rho (a e_1 + b e_2)

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a b 0 0
b c * *
0 * * *
0 * * *

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 ($BC"$7(B, \rho > 0.  \rho = 0 $B$@$H>/$70c$C$F$-$^$9(B.)
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$BHsIi$H$+$,=P$F$-$^$9(B.

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> $B$&$+(B? $B$^$?LdBj2r7h$KEv$?$j!"%R%s%H$N$"$k;29MJ88%$dK\$,$"$j$^$7$?(B
> $B$i!"8f>R2p2<$5$$!#(B

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-- 
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Tsukamoto, C. : chiaki@ipc.kit.ac.jp