The conjecture on asymptotics of rapidly oscillating solutions to delay equations

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Let s∈[1,2]s\in[1,2] be arbitrary. Consider the delay differential equation (1), with coefficient c(t)c(t) and delay function \Greekmath011C(t)\Greekmath 011C (t) satisfying the assumptions in (10a), and suppose

sup⁡t≥\Greekmath011A∫\Greekmath011C(t)t∣c(\Greekmath0110)∣ d\Greekmath0110=s,∣c(\Greekmath0110)∣≤1,∀\Greekmath0110≥0,\sup_{t\geq\Greekmath 011A }\int_{\Greekmath 011C (t)}^t|c(\Greekmath 0110 )|\,d\Greekmath 0110 =s,\qquad |c(\Greekmath 0110 )|\leq1,\qquad \forall\Greekmath 0110 \geq0,

where \Greekmath011A\Greekmath 011A satisfies (10a). A solution is Λ(s)\Lambda(s)-rapidly oscillating according to the definition used in the source. Asymptotic-profile conjecture. All solutions of (1) that are Λ(s)\Lambda(s)-rapidly oscillating and nonnegative, and do not tend to zero, are asymptotic to xsx_s. The conjecture proposes a precise asymptotic profile for this class of non-decaying solutions; the source states that the problem remains open.

References

Primary source

John Ioannis Stavroulakis and Elena Braverman, “Stability and oscillation of linear delay differential equations”, arXiv:2012.10726 (2020).

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