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Then your last example min = FindMinimum[Simplify[Norm[Flatten[FXlambda]]], {{a, 1/Nt}, {b, 0}, {d, 1/Nt}}, WorkingPrecision -> 128, AccuracyGoal -> 64, MaxIterations -> 10^4]; FXlambda /. min[[2]] or min =...