Let Q be the set of quaternion numbers and Mn (Q)the set of n ×n quaternion matrices.If quater-nion right linear Maps Φ(A)=UAU -1 or Φ(A)=UAT U -1 :M2 (Q)→M2 (Q)preserving Left Spectrum,then qua-ternion unitary matrix is real.%设 Q 表示四元数集合,Mn (Q)表示 n ×n 四元数矩阵的集合。对于四元数右线性映射Φ(A)=UAU -1或Φ(A)=UAT U -1:M2(Q)→ M2(Q),若σl Φ[(A ])=σl (A),则四元数酉阵 U 是实数矩阵。
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