Renorm-group symmetry for functionals of boundary value problem solutions

Recent advances in generalizing the renorm-group algorithm for boundary value problems of mathematical physics and the related concept of the renorm-group symmetry, previously formulated with reference to models based on differential equations, are revisited. The algorithm and symmetry are now formulated for models with nonlocal (integral) equations. Examples illustrate how the updated algorithm applies to models with nonlocal terms appearing as linear functionals of the solution.