55Rxx Fiber spaces and bundles in algebraic topology [See also 18F15, 32Lxx, 46M20, 57R20, 57R22, 57R25] 7457
55R40 Homology of classifying spaces and characteristic classes in algebraic topology [See also 57Txx, 57R20] 1223
57Rxx Differential topology {For foundational questions of differentiable manifolds, see 58Axx; for infinite-dimensional manifolds, see 58Bxx} 21426