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answered 2023-01-30 20:00:15 +0100
A=matrix(SR,2,2,[3, -13, 5,1]) eig=A.eigenvectors_right(); eig [(-8*I + 2, [(1, 8/13*I + 1/13)], 1), (8*I + 2, [(1, -8/13*I + 1/13)], 1)]
(Replace QQ by SR)