Topology
compute properties of an interval of real numbers
[3,8)
compare intervals
intervals [0,1), (1,oo)
compute properties of a knot
trefoil knot
specify a knot using Alexander-Briggs notation
8_1 knot
compare several knots
Stevedore knot, figure eight knot
Homotopy Groups of Spheres
compute homotopy groups of a sphere
homotopy 3-sphere
compute a specified homotopy group