57XX 


Manifolds and cell complexes {For complex manifolds, see 32Qxx} 

57Mxx 

Lowdimensional 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 
Twodimensional complexes 


57M25 
Knots and links in $S^3$ {For higher dimensions, see 57Q45} 


57M27 
Invariants of knots and 3manifolds 


57M30 
Wild knots and surfaces, etc., wild embeddings 


57M35 
Dehn's lemma, sphere theorem, loop theorem, asphericity 


57M40 
Characterizations of $E^3$ and $S^3$ (PoincarĂ© conjecture) [See also 57N12] 


57M50 
Geometric structures on lowdimensional manifolds 


57M60 
Group actions in low dimensions 


57M99 
None of the above, but in this section 