Congruence
in the theory of smooth manifolds, the set of integral curves defined by a nonvanishing vector field defined on the manifold
en-US/ˈkɑŋɡɹuəns/
en-GB/ˈkɒnɡɹuːəns/
in the theory of smooth manifolds, the set of integral curves defined by a nonvanishing vector field defined on the manifold