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En (Lie algebra) : ウィキペディア英語版
En (Lie algebra)

In mathematics, especially in Lie theory, E''n'' is the Kac–Moody algebra whose Dynkin diagram is a bifurcating graph with three branches of length 1,2, and ''k'', with ''k''=''n-4''.
In some older books and papers, ''E''2 and ''E''4 are used as names for ''G''2 and ''F''4.
==Finite-dimensional Lie algebras==

The En group is similar to the An group, except the nth node is connected to the 3rd node. So the Cartan matrix appears similar, -1 above and below the diagonal, except for the last row and column, have -1 in the third row and column. The determinant of the Cartan matrix for En is 9-''n''.
*E3 is another name for the Lie algebra ''A''1''A''2 of dimension 11, with Cartan determinant 6.
*:\left (2 & -1 & 0 \\
-1 & 2 & 0 \\
0 & 0 & 2
\end\right )
*E4 is another name for the Lie algebra ''A''4 of dimension 24, with Cartan determinant 5.
*:\left (2 & -1 & 0 & 0 \\
-1 & 2 & -1& 0 \\
0 & -1 & 2 & -1 \\
0 & 0 & -1 & 2
\end\right )
*E5 is another name for the Lie algebra ''D''5 of dimension 45, with Cartan determinant 4.
*:\left (2 & -1 & 0 & 0 & 0 \\
-1 & 2 & -1& 0 & 0 \\
0 & -1 & 2 & -1 & -1 \\
0 & 0 & -1 & 2 & 0 \\
0 & 0 & -1 & 0 & 2
\end\right )
*E6 is the exceptional Lie algebra of dimension 78, with Cartan determinant 3.
*:\left (2 & -1 & 0 & 0 & 0 & 0 \\
-1 & 2 & -1& 0 & 0 & 0 \\
0 & -1 & 2 & -1 & 0 & -1 \\
0 & 0 & -1 & 2 & -1 & 0 \\
0 & 0 & 0 & -1 & 2 & 0 \\
0 & 0 & -1 & 0 & 0 & 2
\end\right )
*E7 is the exceptional Lie algebra of dimension 133, with Cartan determinant 2.
*:\left (2 & -1 & 0 & 0 & 0 & 0 & 0 \\
-1 & 2 & -1& 0 & 0 & 0 & 0 \\
0 & -1 & 2 & -1 & 0 & 0 & -1 \\
0 & 0 & -1 & 2 & -1 & 0 & 0 \\
0 & 0 & 0 & -1 & 2 & -1 & 0 \\
0 & 0 & 0 & 0 & -1 & 2 & 0 \\
0 & 0 & -1 & 0 & 0 & 0 & 2
\end\right )
*E8 is the exceptional Lie algebra of dimension 248, with Cartan determinant 1.
*:\left (2 & -1 & 0 & 0 & 0 & 0 & 0 & 0 \\
-1 & 2 & -1& 0 & 0 & 0 & 0 & 0 \\
0 & -1 & 2 & -1 & 0 & 0 & 0 & -1 \\
0 & 0 & -1 & 2 & -1 & 0 & 0 & 0 \\
0 & 0 & 0 & -1 & 2 & -1 & 0 & 0 \\
0 & 0 & 0 & 0 & -1 & 2 & -1 & 0 \\
0 & 0 & 0 & 0 & 0 & -1 & 2 & 0 \\
0 & 0 & -1 & 0 & 0 & 0 & 0 & 2
\end\right )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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