Null Homotopic

Some articles on homotopic:

Homotopy Groups Of Spheres - Background - Homotopy Group
... maps two maps connected by a homotopy are said to be homotopic ... plane, and where two closed curves produce the same integral result if they are homotopic in the topological space consisting of the plane minus the points of singularity ... so that two maps are in the same class if they are homotopic ...

Famous quotes containing the word null:

    A strong person makes the law and custom null before his own will.
    Ralph Waldo Emerson (1803–1882)