Clean closed manifolds don't have any neighborhood invariants (other than dimension), though geometric manifolds have area invariants, notably the curvature of a Riemannian manifold as well as torsion of a manifold Geared up with the affine connection. When included in a fluid Command and/or regulation method, valve manifolds have revealed http://lanevlymz.acidblog.net/18157590/not-known-details-about-manifold-valve