Assertion: rotation's plane | /r/HasProperty | x y − y
Facets:
Source sentences:
text: Since ( 0 1 − 1 0 ) 2 = ( − 1 0 0 − 1 ) , {\displaystyle {\begin{pmatrix}0&1\\-1&0\end{pmatrix}}^{2}\ =\ {\begin{pmatrix}-1&0\\0&-1\end{pmatrix}},} the plane of matrices ( x y − y x )