Sufficient conditions for stability, global asymptotic stability, and explosive instability are established for a class of nonlinear evolutional equations defined in Hilbert spaces by using certain relations between an abstract function and its Gateaux differential. These results are applied to specific forms of nonlinear evolutional equations arising from physics, in particular, a finite‐dimensional system of complex ordinary differential equations, functional differential equations, and systems of complex partial differential equations describing nonlinear diffusion or wave phenomena.

1.
Ju. L. Daleckii and M. G. Krein, Stability of Solutions of Differential Equations in Banach Space, Trans. Math. Monographs, Vol. 43 (Am. Math. Soc., Providence, R. I., 1974).
2.
G. E. Ladas and V. Lakshmikantham, Differential Equations in Abstract Spaces (Academic, New York, 1972).
3.
J. K.
Hale
,
J. Math. Anal. Appl.
26
,
39
(
1969
).
4.
J. Moser (Ed.), Dynamical System, Theory and Applications, Lecture Notes in Phys. No. 38 (Springer‐Verlag, Berlin, 1975).
5.
G. B. Whitham, Linear and Nonlinear Waves (Wiley, New York, 1974).
6.
L.
Markus
,
Rend. Sem. Mat. Politecnico Torino
11
,
271
(
1952
).
7.
L. E. Payne, Improperly Posed Problems in Partial Differential Equations, Regional Conf. Series in Appl. Math. No. 22 (Soc. Ind. Appl. Math., Philadelphia, 1975).
8.
P. K. C.
Wang
,
J. Math. Phys.
16
,
251
(
1975
).
9.
M. M. Vainberg, Variational Methods for the Study of Nonlinear Operators (Holden‐Day, San Francisco, 1964), p. 36.
10.
V. Lakshmikantham and S. Leela, Differential and Integral Inequalities, Vol. 1 (Academic, New York, 1969), p. 15.
11.
N. N.
Krasovskii
,
Prikl. Mat. Mekh.
18
,
735
(
1954
).
12.
N. N.
Krasovskii
,
Prikl. Mat. Mekh.
21
,
309
(
1957
).
13.
L.
Markus
and
H.
Yamabe
,
Osaka Math. J.
12
,
307
(
1960
).
14.
H.
Wilhelmsson
,
Phys. Rev. A
6
,
1973
(
1973
).
15.
P. K. C.
Wang
,
Nuovo Cimento B
24
,
63
(
1974
).
16.
G. F.
Webb
,
J. Diff. Equations
20
,
71
(
1976
).
17.
L. S.
Pontryagin
,
Izv. Akad. Nauk SSSR, Ser. Mat.
6
,
115
(
1942
).
18.
R. Bellman and K. L. Cooke, Differential‐Difference Equations (Academic, New York, 1963).
19.
S. Agmon, Lectures on Elliptic Boundary‐Value Problems (Van Nostrand, New York, 1965).
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