57Mxx Low-dimensional topology

57M05  Fundamental group, presentations, free differential
               calculus
57M07  Topological methods in group theory
57M10  Covering spaces
57M12  Special coverings, e.g. branched
57M15  Relations with graph theory, See also {05Cxx}
57M20  Two-dimensional complexes
57M25  Knots and links in $S^3$, {For higher dimensions, See
               57Q45}
57M30  Wild knots and surfaces, etc., wild embeddings
57M35  Dehn's lemma, sphere theorem, loop theorem, asphericity
57M40  Characterizations of $E^3$ and $S^3$ (Poincare
               conjecture), See also {57N12}
57M50  Geometric structures on low-dimensional manifolds
57M60  Group actions in low dimensions
57M99  None of the above but in this section