AN INVARIANCE PRINCIPLE IN THE THEORY OF STABILITY

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[l] Yoshizawa, T.,
Ret'erences
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of differential equations, Contrib. to Diff. Eq., 1(1963),
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Method with Applications, Academic Press, New York, 1961.
[6] Miller, R,, On almost periodic differential equations, Bul.
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[8] Krasovskii, N.N., Stability of Motion, StanYmi University Press,
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[9] Hale, J., "Geometric theory of functional differential equations",
Proc. of An International Symposium on Differential Equations
and Dynamical Systems, University of Puerto Rico,Mayaguez, P. R.,
Dec. 1963, Academic Press, New York (to appear).