Omschrijving
Considers scalar lattice differential equations posed on square lattices in two space dimensions. Under certain natural conditions they show that wave-like solutions exist when obstacles (characterized by “holes”) are present in the lattice.
Aaron Hoffman, Franklin W. Olin College of Engineering, Needham, MA.
Hermen Hupkes, Mathematisch Instituut, Universiteit Leiden, The Netherlands.
E.S. Van Vleck, University of Kansas, Lawrence, KS.