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¨¥ ¤£ ¡ 1 <br />

¨ <br />

det Bk<br />

<br />

1<br />

2<br />

= 0 <br />

−1<br />

0<br />

−1<br />

k<br />

1<br />

−1<br />

−1<br />

−k<br />

1<br />

0<br />

k<br />

k<br />

2<br />

<br />

<br />

<br />

=<br />

<br />

−1<br />

k<br />

1<br />

−1<br />

−k<br />

1<br />

<br />

k <br />

k <br />

2<br />

−<br />

<br />

<br />

<br />

<br />

2<br />

0<br />

−1<br />

−1<br />

k<br />

1<br />

k<br />

k<br />

2<br />

<br />

<br />

= k <br />

<br />

<br />

<br />

= k − <br />

<br />

<br />

−k 2 <br />

−1 −1 k<br />

1 −1 1<br />

1 1 2<br />

−1 1<br />

1 2<br />

1 1<br />

1 2<br />

<br />

<br />

<br />

<br />

− k <br />

<br />

<br />

<br />

+ <br />

<br />

<br />

+ <br />

1 1<br />

1 2<br />

0 1<br />

−1 1<br />

2 −1 k<br />

0 1 1<br />

−1 1 2<br />

<br />

<br />

+ k <br />

<br />

<br />

+ k <br />

= k (4 + 2k) − k (3 + k) = k 2 + k<br />

<br />

<br />

<br />

<br />

1 −1<br />

1 1<br />

0 1<br />

−1 1<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

det Bk = 2 ⇐⇒ k2 − k = 2 ⇐⇒ k2 − k − 2 = 0<br />

¡ ¨ H = ⎣ <br />

<br />

<br />

<br />

det H = <br />

<br />

<br />

⇐⇒ (k − 1)(k + 2) = 0 ⇐⇒ k = 1 k = −2<br />

⎡<br />

x a b 0 c<br />

0 y 0 0 d<br />

0 e z 0 f<br />

g h k u ℓ<br />

0 0 0 0 v<br />

x a b 0 c<br />

0 y 0 0 d<br />

0 e z 0 f<br />

g h k u ℓ<br />

0 0 0 0 v<br />

<br />

<br />

<br />

<br />

= v<br />

<br />

⎤<br />

⎦ det<br />

<br />

H<br />

¨¥ ¨ £ ¡ 5 ¡ 4 ¡ 1<br />

<br />

<br />

<br />

1<br />

= vuxyz<br />

x a b 0<br />

0 y 0 0<br />

0 e z 0<br />

g h k u<br />

¡ ¨ <br />

am + bp an + bq<br />

cm + dp cn + dq<br />

<br />

<br />

<br />

<br />

= vu<br />

<br />

x a b<br />

0 y 0<br />

0 e z<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

= vux<br />

<br />

<br />

= (mq − np) (ad −<br />

<br />

bc)<br />

¨¥ ¨ <br />

<br />

<br />

<br />

<br />

<br />

<br />

am + bp an + bq<br />

cm + dp cn + dq<br />

<br />

= <br />

am an<br />

cm + dp cn + dq<br />

<br />

+ <br />

bp bq<br />

cm + dp cn + dq<br />

<br />

<br />

<br />

y 0<br />

e z<br />

57

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