Question: Eigen values on the circle Illustrate with a 2 x 2 matrix that an Eigen value may very well lie on a Gerschgorin circle (so

Eigen values on the circle Illustrate with a 2 x 2 matrix that an Eigen value may very well lie on a Gerschgorin circle (so that Gerchgorin disks can generally not be replaced with smaller disks without losing the inclusion property).

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