Let a epsilon cn times n be diagonalizable with eigenvalues

Let a epsilon c^n times n be diagonalizable with eigenvalues 0 lessthanorequalto lambda_1 lessthanorequalto lambda_2 lessthanorequalto ... lessthanorequalto lambda_n. express in the terms of the spectral decomposition of a the set of vectors x, and y for which lambda_1 lessthanorequalto x^t a y/x^t y lessthanorequalto lambda_n

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