Parabolic PDEs on low-dimensional structures

Abstract: The paper concerns the theory of parabolic equations on a broad class of closed subsets of Euclidean space possessing a kind of tangent structure. A necessary framework for considering evolutionary problems is developed, and fundamental results about the existence and uniqueness of solutions are established. The presented approach is based on applying the semigroup theory of linear operators combined with special geometric constructions related to the shape of the examined structure. The proposed setting is consistent with the theory of elliptic equations on lower dimensional structures and with the second-order calculus of variations developed by Bouchitt\'e and Fragala.