has 2D boundary
A 2D boundary may have holes and gaps, but it must be a single connected entity, not an aggregate of several disconnected parts.
Although the boundary is two-dimensional, it exists in three-dimensional space and thus has a 3D shape.
a relation between a material entity and a 2D immaterial entity (the boundary), in which the boundary delimits the material entity
has 2D boundary
has boundary
has_2D_boundary
my body has 2D boundary the surface of my skin
material entity
immaterial entity
axiom holds for all times
has 2D boundary
A 2D boundary may have holes and gaps, but it must be a single connected entity, not an aggregate of several disconnected parts.
Although the boundary is two-dimensional, it exists in three-dimensional space and thus has a 3D shape.
a relation between a material entity and a 2D immaterial entity (the boundary), in which the boundary delimits the material entity
has 2D boundary
has boundary
has_2D_boundary
my body has 2D boundary the surface of my skin