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˙y = 1 − x 2 y 2 y(0) = α α ∈ R<br />

y2(x)−y1(x) α2 −α1 > 0 <br />

0 x → +∞ <br />

α + = α − = α ∗ <br />

x ≤ 0 x ≥ 0<br />

R |α| ≤ −α ∗<br />

R <br />

<br />

⎧<br />

⎪⎨<br />

y ′ = y 4 −<br />

⎪⎩<br />

y(1) = 0,<br />

x2 ,<br />

(1 + |x|) 2<br />

<br />

<br />

<br />

f(x, y) = y 4 x<br />

−<br />

2<br />

.<br />

(1 + |x|) 2<br />

<br />

˙y = 0<br />

<br />

<br />

|x|<br />

y = ±<br />

1 + |x| ,

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