SteadyStokes221AssembleTanMat_NeumanFacetOn this pageAssembleTanMat_NeumanFacet Assemble tangent matrix internal facet. Interface INTERFACE MODULE SUBROUTINE AssembleTanmat_NeumanFacet(obj) CLASS(AbstractSteadyStokes_), INTENT(INOUT) :: obj END SUBROUTINE AssembleTanmat_NeumanFacetEND INTERFACE Example