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Questions about the properties of vector spaces and linear transformations, including linear systems in general.
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Estimate on the real and imaginary parts of eigenvalues
Let $A$ be a matrix. If $A$ is "almost" equal to $A^*$, it follows from an argument of continuity that the eigenvalues of $A$ are "almost" real. Same argument can be made for $A$ "almost" $-A^*$, in w …