< Achsenkreuz < R^3 < Uneigentlich <
Aufgabe
−
E
3
=
(
−
1
0
0
0
−
1
0
0
0
−
1
)
.
{\displaystyle {}-E_{3}={\begin{pmatrix}-1&0&0\\0&-1&0\\0&0&-1\end{pmatrix}}\,.}
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