On a periodic-type boundary value problem for first-order nonlinear functional differential equations
Here, the solvability and the unique solvability of the boundary value problem \[ u'(t)= F(u)(t),\quad u(a)-\lambda u(b)= h(u),\tag{\(*\)} \] are discussed, where \(F\in K_{ab}\), \(K_{ab}\) is the set of continuous operators \(F: C([a, b],\mathbb{R})\to L([a,b]),\mathbb{R})\) satisfying the Carathéodory condition, that is, for every \(r> 0\) there exists \(q_r\in L([a, b],\mathbb{R}_+)\) such that \[ |F(v)(t)|\leq q_r(t)\text{ for }t\in [a,b],\quad\|v\|_C\leq r, \] \(\lambda\in \mathbb{R}_+\) and \(h: C([a, b],\mathbb{R})\to \mathbb{R}\) is continuous. Different types of sufficient conditions are obtained for the solvability of \((*)\). Examples are given to illustrate the results obtained.
first-order nonlinear functional-differential equations
scientific article; zbMATH DE number 1810000
scientific article