... RXã f Xlim infyxf(y) f(x), x X.ã f(x)f(x) = {x X∗: f(x) ≤ f(y) + x∗, x − y, ∀y ∈ X}.x∗∈ X∗f x ∂f(x)f xXX∗X f : X → R ∪ {+∞}X ∂fX X∗f x ∈ Xx∗∈ X∗limλ→+0f(x ... f1(x)|2dx12.ϕ0(s)f1(x) = f0(x) + NbaK(x, s)sin(ωs)dsϕ1(s) = ϕ0(s) + Nsin(ωs).N ω f0f1L2[a,b]ρL2[a,b](f0, f1) = |N|babaK(x, s)sin(ωs)ds2dx12Kmax= maxa≤s,x≤b|K(x, ... Ay.Gr(A)Gr(A)X ì XAx X Ax, x 0 AA ≥ 0 A XH A : H → HAx − Ay ≤ x − y, ∀x, y ∈ X. I − A I HA : RM→ RMA = BTB,B MAδ(t) t ≥ 0 δ(0) = 0Ax − Ay, x − y ≥ δ(x − y), ∀x, y ∈...