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2 × 2 <br />

t ↦→ x(t) <br />

Φ(c1, c2, t) xp(t) ¨x − T ˙x + D x = ψ(t) <br />

<br />

<br />

⎧<br />

⎪⎨<br />

x(t) = Φ(c1, c2, t) + xp(t)<br />

⎪⎩ y(t) = 1<br />

<br />

1 d<br />

( ˙x − ax − f(t)) =<br />

b b dt Φ(c1, c2, t) + x ′ <br />

<br />

p(t) − a(Φ(c1, c2, t) + xp(t)) − f(t) .<br />

<br />

<br />

<br />

x<br />

A = 0.<br />

y<br />

det A = 0 x = y = 0 <br />

det A = 0 (x, y) <br />

ax + by = 0 det A = 0 <br />

<br />

λ1 λ2 <br />

λ1 = λ2 <br />

<br />

λ1 = λ2 <br />

<br />

λ1 = λ2 <br />

<br />

λ1 = λ2 = λ <br />

λ1 = λ2 = λ <br />

λ1 = α + iβ λ2 = α − iβ α > 0 <br />

λ1 = α + iβ λ2 = α − iβ α < 0 <br />

λ1 = iβ λ2 = −iβ <br />

<br />

<br />

<br />

a = b = c = d = 0

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