2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18817We explain the linear growth of smooth solid helium facets by the presence of lattice point defects. To implement this task, the framework of very general two-velocity elasticity theory equations is developed. Boundary conditions for these equations for various surface types are derived. We also suggest additional experiments to justify the concept.12 pages, 4 figuresStatistical MechanicsSoft Condensed Mattertext