75. .
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散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0. Let also
−
*
F := (xy)i+(y2
+z2
)j+ex3
k.
(a) curl
−
*
F = .
(b) If S1 is the boundary surface of E (including all faces) endowed with the
outward orientation, one has
Ï
S1
curl
−
*
F ·d
−
*
S = .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 29 / 37
77. .
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散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(b) If S1 is the boundary surface of E (including all faces) endowed with the
outward orientation, one has
Î
S1
curl F·d
−
*
S = .
由散度定理
Ï
S1
curl
−
*
F ·d
−
*
S =
Ñ
E
div
(
curl
−
*
F
)
dV
=
Ñ
E
0dV = 0
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 31 / 37
78. .
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散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
79. .
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散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
設移去之面為 K =
{
(x,y,0)
¯
¯ x,y ≥ 0,x+y ≤ 3
}
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
80. .
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.
散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
設移去之面為 K =
{
(x,y,0)
¯
¯ x,y ≥ 0,x+y ≤ 3
}
S1 = S2
∪
K ⇒
:0
Ï
S1
curl
−
*
F ·d
−
*
S =
Ï
S2
curl
−
*
F ·d
−
*
S +
Ï
K
curl
−
*
F ·d
−
*
S
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
81. .
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.
散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
設移去之面為 K =
{
(x,y,0)
¯
¯ x,y ≥ 0,x+y ≤ 3
}
S1 = S2
∪
K ⇒
:0
Ï
S1
curl
−
*
F ·d
−
*
S =
Ï
S2
curl
−
*
F ·d
−
*
S +
Ï
K
curl
−
*
F ·d
−
*
S
Ï
S2
curl
−
*
F ·d
−
*
S = −
Ï
K
curl
−
*
F ·d
−
*
S
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
82. .
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.
散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
−
Ï
K
curl
−
*
F ·d
−
*
S = −
ˆ 3
0
ˆ 3−y
0
(
−2z,−3x2
ex3
,1
)
·(0,0,−1)dxdy
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
83. .
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.
散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
−
Ï
K
curl
−
*
F ·d
−
*
S = −
ˆ 3
0
ˆ 3−y
0
(
−2z,−3x2
ex3
,1
)
·(0,0,−1)dxdy
= −
ˆ 3
0
ˆ 3−y
0
(−1)dxdy
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
84. .
.
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.
.
散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
−
Ï
K
curl
−
*
F ·d
−
*
S = −
ˆ 3
0
ˆ 3−y
0
(
−2z,−3x2
ex3
,1
)
·(0,0,−1)dxdy
= −
ˆ 3
0
ˆ 3−y
0
(−1)dxdy =
ˆ 3
0
ˆ 3−y
0
dxdy
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37
85. .
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.
.
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.
.
散度定理與旋度定理 散度定理
台大 107 轉學考微積分 B
Let E be tetrahedron (四面體) in ’3
bounded by the planes
x+y +z = 3,x = 2z,y = 0 and z = 0.
(a) curl
−
*
F = (−2z,−3x2
ex3
,1) .
(c) If S2 is the surface obtained from S1 by removing the face in the xy-plane
whlie keeping the orientation from S1 on all other faces, one then has
Ï
S2
curl
−
*
F ·d
−
*
S = .
−
Ï
K
curl
−
*
F ·d
−
*
S = −
ˆ 3
0
ˆ 3−y
0
(
−2z,−3x2
ex3
,1
)
·(0,0,−1)dxdy
= −
ˆ 3
0
ˆ 3−y
0
(−1)dxdy =
ˆ 3
0
ˆ 3−y
0
dxdy
=
3×3
2
=
9
2
卓永鴻 (http://CalcGospel.in) 淺說向量微積分 June 10, 2019 32 / 37