Algebraic topology Biology and other natural sciences -- Chemistry -- Molecular structure (graph-theoretic methods, methods of differential topology, etc.) Biology and other natural sciences -- Genetics and population dynamics -- Protein sequences, DNA sequences Biology and other natural sciences -- Physiological, cellular and medical topics -- Biochemistry, molecular biology Geometry Information and communication, circuits -- Circuits, networks -- Applications of graph theory Knot theory Manifolds and cell complexes -- Low-dimensional topology -- Knots and links in $S^3$ Manifolds and cell complexes -- Low-dimensional topology -- Relations with graph theory Molecular biology Topology