Abstract
1. We mentioned in Chapter 3 the original definition of structural stability for autonomous systems of differential equations given by Andronov and Pontryagin in [1], In this work Andronov and Pontryagin considered systems on a two-dimensional sphere, S2 or on a disc D2 ⊂ ℝ 2 ; it was supposed in the latter case that trajectories intersect the boundary of D2 entering D2 as t grows.
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