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£¢¥¤ ¨ ¡ ¢¨ ¦¥§¢ ¡ ¢ ¤ ¦ ©¨ <br />

<br />

¡ ¨ § α ∈ IR <br />

<br />

⎧<br />

⎪⎨<br />

⎪⎩<br />

−x − y + z = −1<br />

3x + (α + 2)y − 3z = 3<br />

¢ ¢ <br />

α<br />

¥ <br />

α =<br />

<br />

2<br />

¡ ¨ A =<br />

<br />

A<br />

2x + (α + 1)y − (α + 2)z = 2<br />

β 1 −1<br />

2 β + 2 2<br />

2β + 1 3 −1<br />

<br />

β ∈ IR<br />

<br />

A β <br />

det<br />

¡ ¨ <br />

A <br />

¡ ¨ −1 A A<br />

z<br />

A<br />

<br />

¡ ¨ ¢ x y <br />

<br />

<br />

α − 1 −α −1<br />

(S)<br />

α + 3 α − 2 0<br />

2 α − 1 1<br />

<br />

x 1<br />

= 1<br />

<br />

α IR ∈ ¡ <br />

(S) ¢ ¢ <br />

(S)<br />

<br />

¡ ¨ <br />

2 F = {(a, a ) |<br />

¢¢¡ a 2<br />

∈ IR} IR<br />

<br />

G = A ∈ Mn×n(IR) | A + AT ¢ <br />

= αIn α ¡ ∈ IR<br />

Mn×n(IR)<br />

<br />

¡ ¨ IR 4 <br />

<br />

F = (a, b, c, d) ∈ IR 4 | d = a + b + c <br />

Gα = (α, 1, 0, 1), (1, 0, 1, 1), (1, 2, −1, 1) <br />

y<br />

z<br />

1<br />

<br />

185

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