Karakostas, George L.Palaska, Konstantina2021-08-182021-08-182007-10-30Karakostas, G. L., & Palaska, K. G. (2007). Regularization for evolution equations in Hilbert spaces involving monotone operators via the semi-flows method. <i>Electronic Journal of Differential Equations, 2007</i>(145), pp. 1-18.1072-6691https://hdl.handle.net/10877/14359In a Hilbert space H consider the equation d/dt x(t) + T(t)x(t) + α(t)x(t) = ƒ(t), t ≥ 0, where the family of operators T(t), t ≥ 0 converges in a certain sense to a monotone operator S, the function α vanishes at infinity and the function ƒ converges to a point h. In this paper we provide sufficient conditions that guarantee the fact that full limiting functions of any solution of the equation are points of the orthogonality set O(h; S) of S at h, namely the set of all x ∈ H such that ⟨Sx - h, x - z⟩ = 0, for all z ∈ S-1(h). If the set O(h; S) is a singleton, then the original solution converges to a solution of the algebraic equation Sz = h. Our problem is faced by using the semi-flow theory and it extends to various directions the works [1, 12].Text18 pages1 file (.pdf)enAttribution 4.0 InternationalHilbert spacesMonotone operatorsRegularizationEvolutionsSemi-flowsLimiting equationsFull limiting functionsConvergenceArticle