Explore rubber sheet geometry and knots through 33 interactive demonstrations.
Continuity, homeomorphisms, and the rubber sheet analogy
Genus, orientability, and the Euler characteristic
Knots, links, and the fundamental Reidemeister moves
Crossing number, tricolorability, and unknotting number
Jones, Alexander, and HOMFLY-PT polynomials - the computational crown jewels
Knot groups and the connection to group theory
Seifert surfaces, knot cobordism, and hyperbolic knots
DNA topology, molecular knots, physics, and art
Interactive tools to draw knots, explore properties, and test your knowledge