Three-manifolds (Topology) Topological manifolds Fiber spaces (Mathematics) Geometric group theory Group theory and generalizations Homotopy theory Knot theory Manifolds (Mathematics) Manifolds and cell complexes Special aspects of infinite or finite groups Topology of general $3$-manifolds Algebraic geometry Birational geometry Classical differential geometry Connections with homological algebra and category theory Coverings Differential geometric aspects of harmonic maps Differential geometry Functional analysis General topology Geometric structures on low-dimensional manifolds Global differential geometry Hyperbolic groups and nonpositively curved groups Invariants of knots and 3-manifolds Knots and links (in high dimensions) Knots and links in $S^3$ Linear function spaces and their duals Low-dimensional topology Maps and general types of spaces defined by maps Minimal surfaces, surfaces with prescribed mean curvature