Slide 32
Slide 32 text
實數 N 維李代數
REAL LIE ALGEBRA OF DIMENSION N
一個 n 實數向量空間 L
(想成 R
n
),
一個「交換子」(commutator) [
X
, Y
]
,而且
1. [
X
, Y
] in L for all X
, Y in L
.
2. [
a
X + b
Y
, Z
] = a
[
X
, Z
] + b
[
Y
, Z
]
for all X
, Y
, Z in L
.
3. [
X
, Y
] = -
[
Y
, X
] for all X
, Y in L
.
4. [
X
,
[
Y
,
Z
]
] + [
Y
,
[
Z
,
X
]
] + [
Z
,
[
X
,
Y
]
] = 0
for all X
, Y
, Z in L
.