Mapping-class Groups of Pairs
Given a pair of spaces (X,A) the mapping class group of the pair is the isotopy-classes of automorphisms of the pair, where an automorphism of (X,A) is defined as an automorphism of X that preserves A, i.e. f: X → X is invertible and f(A) = A.
Read more about this topic: Mapping Class Group
Famous quotes containing the word groups:
“Trees appeared in groups and singly, revolving coolly and blandly, displaying the latest fashions. The blue dampness of a ravine. A memory of love, disguised as a meadow. Wispy cloudsthe greyhounds of heaven.”
—Vladimir Nabokov (18991977)
Related Phrases
Related Words