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R2 \ {y = 0} <br />
<br />
h(x, y)ω(x, y) = y dx + x − 1<br />
<br />
dy.<br />
y<br />
H + = {(x, y) : y > 0} H − = {(x, y) : y <<br />
0} <br />
V + V − H + H − <br />
H + (0, 1) (x0, y0) H + <br />
γ = γ1 ∪ γ2 γ1(x) = (x, 0) <br />
0 ≤ x ≤ x0 x0 ≤ x ≤ 0 γ2(y) = (x0, y) 1 < y < y0 0 < y0 ≤ y ≤ 1<br />
V + <br />
<br />
<br />
x0<br />
y0<br />
(x0, y0) = h(x, y)ω(x, y) + h(x, y)ω(x, y) = dx + x0 − 1<br />
<br />
dy<br />
y<br />
γ1<br />
γ2<br />
= x0 + [x0y − log |y|] y=y0<br />
y=1 = x0 + x0y0 − log y0 − x0 = x0y0 − log y0<br />
V + (x, y) = xy−log y y > 0 H + V + (x, y) =<br />
c c ∈ R<br />
V − H − (0, −1) <br />
(x0, y0) H + <br />
γ = γ1 ∪ γ2 γ1(x) = (x, 0) 0 ≤ x ≤ x0 x0 ≤ x ≤ 0 γ2(y) = (x0, y)<br />
−1 < y < y0 < 0 y0 ≤ y ≤ −1<br />
V − <br />
<br />
(x0, y0) = h(x, y)ω(x, y) +<br />
=<br />
γ1<br />
x0<br />
0<br />
γ2<br />
y0<br />
−1 dx + x0 −<br />
−1<br />
1<br />
<br />
y<br />
0<br />
h(x, y)ω(x, y)<br />
= −x0 + [x0y − log |y|] y=y0<br />
y=−1 = x0 + x0y0 − log |y0| + x0<br />
= x0y0 − log |y0| = x0y0 − log(−y0),<br />
y0 < 0 V − (x, y) = xy − log y y < 0 <br />
H − V − (x, y) = c c ∈ R<br />
V (x, y) = xy − log |y| R 2 \ {y = 0}<br />
R 2 \ {y = 0} xy − log |y| = c c ∈ R<br />
<br />
y ′ = y(1 − y)<br />
y ′ = (x + y) 2 − (x + y) − 1<br />
y ′ − y = e x√ y<br />
<br />
y(x) = 0 y(x) = 1 y = 0, 1 <br />
<br />
dy<br />
1<br />
y(1 − y) dy − dx = 0.<br />
0 < y < 1 <br />
<br />
1<br />
x − dy = c, c ∈ R.<br />
y(1 − y)<br />
<br />
<br />
<br />
1<br />
dy =<br />
y(1 − y)<br />
<br />
=<br />
<br />
1<br />
dy =<br />
y(1 − y)<br />
2dy<br />
<br />
1 − (2y − 1) 2 =<br />
<br />
<br />
1<br />
dy =<br />
y − y2 dt<br />
√ 1 − t 2<br />
1<br />
dy<br />
1/4 − (y − 1/2) 2<br />
= arcsin(t) = arcsin(2y − 1).