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a ??? b ????? ??? ?? ???? ??????? a × b, ??? ????? ????? ????? ?? ????? ??? ???????????? (?????) ????? ?? ??? ?? ?? ?? ????? ??? ???? ???? ???? (????) ??? ????? (90 ????? ??) ????? ??? ?? ????
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[1]
[2]
![{\displaystyle \mathbf {a} \times \mathbf {b} =\left\|\mathbf {a} \right\|\left\|\mathbf {b} \right\|\sin \theta \ \mathbf {n} }](https://wikimedia.org/api/rest_v1/media/math/render/svg/e7a55eb041414d1ff41913fcdb8268f1eb6501a4)
???????
a
(blue) ???
b
(red) ?????? ??? ???? ??? ???? ???????
a
×
b
(vertical, in purple) ??? ????? ??? ???? ??????? ?????? ?? ????? ??????? ??? ??????? ?????? ??, ??? ???? ???? ???? ????? ????? ?? ???? ????? ?????? ????? ?? ??? ??? ??? ??? ???? ?
a
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b
? ?? ???? ????? ?? ???? ?? ??????? ????? ??
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????? (
i
,
j
,
k
, ???
e
1
,
e
2
,
e
3
) ???
a
(
a
x
,
a
y
,
a
z
??
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a
1
,
a
2
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u
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[note 1]
determinant
:
![{\displaystyle \mathbf {u\times v} ={\begin{vmatrix}\mathbf {i} &\mathbf {j} &\mathbf {k} \\u_{1}&u_{2}&u_{3}\\v_{1}&v_{2}&v_{3}\\\end{vmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/54054d15364a996c4e11bac2e8d4ce88904fce49)
?? ??????????? ???
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??????? ??????
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![{\displaystyle {\begin{aligned}\mathbf {u\times v} &=\\(u_{2}v_{3}\mathbf {i} +u_{3}v_{1}\mathbf {j} +u_{1}v_{2}\mathbf {k} )-(u_{3}v_{2}\mathbf {i} +u_{1}v_{3}\mathbf {j} +u_{2}v_{1}\mathbf {k} )\\&=\\(u_{2}v_{3}-u_{3}v_{2})\mathbf {i} +(u_{3}v_{1}-u_{1}v_{3})\mathbf {j} +(u_{1}v_{2}-u_{2}v_{1})\mathbf {k} .\end{aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/ebebbee2cba5368862dcec835348850d7eb67e37)
??????? ????? ????? ??? ????? ???? ?? ??? ?? ????? ?? ???, ?? ?? ?????? ????? ??
[3]
![{\displaystyle \mathbf {u\times v} ={\begin{vmatrix}u_{2}&u_{3}\\v_{2}&v_{3}\end{vmatrix}}\mathbf {i} -{\begin{vmatrix}u_{1}&u_{3}\\v_{1}&v_{3}\end{vmatrix}}\mathbf {j} +{\begin{vmatrix}u_{1}&u_{2}\\v_{1}&v_{2}\end{vmatrix}}\mathbf {k} }](https://wikimedia.org/api/rest_v1/media/math/render/svg/be55afd11db029113baa4fc48dc38649b62d8383)
?? ????? ??????? ?? ????? ????? ?? ?? ????? ??
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[4]
The two nonequivalent triple cross products of ???? ???????
a
,
b
,
c
?? ?? ????? ????? ??????
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[
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]
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???? ?? ??-????? ??????? ?? ???? ?? ????? ??, ??? ???? ???? ??????? ?? ?? ???? ????? ??:
![{\displaystyle {\frac {d}{dt}}(\mathbf {a} \times \mathbf {b} )={\frac {d\mathbf {a} }{dt}}\times \mathbf {b} +\mathbf {a} \times {\frac {d\mathbf {b} }{dt}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/9f4da6ae849744cb5ca1b909f4c0382ea7492ff7)
?????
a
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b
?? ????? ?? ?? ??????? ????????
t
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????? ?????? ?? ???? ???? ???? ???????. ??? ??? ???? ???????
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- ↑
Here, “formal" means that this notation has the form of a determinant, but does not strictly adhere to the definition; it is a mnemonic used to remember the expansion of the cross product.
????? ????
[
????
]
- Hazewinkel, Michiel, ed. (2001),
"Cross product"
,
???? ?? ?????????
, ???????,
ISBN
978-1-55608-010-4
- Weisstein, Eric W.
,
???????.html "???? ???????"
,
????-?????
.
- A quick geometrical derivation and interpretation of cross products
- C.A. Gonano and R.E. Zich (2014).
Cross product in N Dimensions - the doublewedge product
, Polytechnic University of Milan, Italy.
- Z.K. Silagadze (2002). Multi-dimensional vector product. Journal of Physics. A35, 4949
Archived
2015-09-05 at the
Wayback Machine
. (it is only possible in 7-D space)
- Real and Complex Products of Complex Numbers
- An interactive tutorial
Archived
2006-04-24 at the
Wayback Machine
. created at
Syracuse University
? (requires
java
)
- W. Kahan (2007). Cross-Products and Rotations in Euclidean 2- and 3-Space. University of California, Berkeley (PDF).