olymmath

RO-NMO 2008 Problem 112

  • Grade 11

Let AA be a n×nn\times n matrix with complex elements. Prove that A−1=A‾A^{-1} = \overline{A} if and only if there exists an invertible matrix BB with complex elements such that A=B−1⋅B‾A= B^{-1} \cdot \overline{B} .

Dataset text AI-MO AoPS. Quoted with source.

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