Objects | Maps | |
Geometry | Points, Lines | Isometries, Similarities,
Affine transformations, Projective Transformations |
Point set topology | Sets, Open Sets | Continuous functions |
Piecewise Linear (PL) Topology | Simplicial Complexes, Cells | PL functions |
Differential Topology | Differentaible Manifolds, Charts | Differentiable, Analytic functions |
Algebraic Topology | CW Complex, Cells | Continuous functions |
A topological space
is a set X together with a family of subsets T={O} called open
sets with the properties: