## Mathematics Subject Classification – MSC2020

History of manifolds and cell complexes [Consider also classification numbers from Section 01-XX]
283

Differential topology {For foundational questions of differentiable manifolds, see 58Axx; for infinite-dimensional manifolds, see 58Bxx}
23887

Symplectic and contact topology in high or arbitrary dimension {For dimensions 3 and 4, see 57K33, 57K43}
1845