A direct constructive proof is given for Pokrzywa's theorem on the closure of orbits of Kronecker canonical pencils under perturbation.
Arnold, Geometrical Methods in the Theory of Ordina ry Differential Equations, Springer-Verlag, 1988
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A constructive proof of Pokrzywa's theorem about perturbations of matrix pencils
A direct constructive proof is given for Pokrzywa's theorem on the closure of orbits of Kronecker canonical pencils under perturbation.