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Figure 1:

Levelset of three convex quadratic functions xTHx with Hessian H of condition number 30. Cigar type: H=diag(30,30,1), Ellipsoid type: H=diag(1,30,30), Discus type: H=diag(1,1,30).

Levelset of three convex quadratic functions $x^{T} H x$ with Hessian $H$ of condition number 30. Cigar type: $H = diag (30, 30, 1)$ ⁠, Ellipsoid type: $H = diag (1, \sqrt{30}, 30)$ ⁠, Discus type: $H = diag (1, 1, 30)$ ⁠.

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