The notion of s-points was introduced by the authors in [SIAM J. Math. Anal., 39 (2008), pp. 1821–1850] in connection with the control problem for the dynamical system governed by the… (More)

R 3 × (−∞,∞); u ||x|<−t= 0, t < 0; lims→∞ su((s+ τ)ω,−s) = f(τ, ω), (τ, ω) ∈ [0,∞) × S2 for a real-valued smooth compactly supported potential q = q(x) and a control f ∈ F = L2([0,∞); L2(S)). The… (More)