Mathematical Sciences Classification System
57Mxx - Low-dimensional topology
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57M05Fundamental group, presentations, free differential calculus
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57M07Topological methods in group theory
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57M10Covering spaces
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57M12Special coverings, e.g. branched
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57M15Relations with graph theory [See also 05Cxx]
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57M20Two-dimensional complexes
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57M25Knots and links in S3 {For higher dimensions, see 57Q45}
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57M27Invariants of knots and 3-manifolds
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57M30Wild knots and surfaces, etc., wild embeddings
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57M35Dehn's lemma, sphere theorem, loop theorem, asphericity
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57M40Characterizations of E3 and S3 (Poincaré conjecture) [See also 57N12]
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57M50Geometric structures on low-dimensional manifolds
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57M60Group actions in low dimensions
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57M99None of the above, but in this section