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We consider the method of positively invariant cones for evolution equations with a cubic nonlinearity of the Duffing type and with a periodic nonlinearity. For equations of the first type, we prove the existence of a positively invariant bounded set. For equations of the second type, we show that the solutions are bounded. We present a lemma on the nonstrict separation of quadratic cones in a rigged Hilbert space.
Differential Equations – Springer Journals
Published: Jan 31, 2015
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