cellular homology
If is a cell space, then let be the cell complex where the -th group
is the free abelian group on the cells of dimension , and the boundary map
is as follows: If is an -cell, then we can define a map , where
is any cell of dimension by the following rule: let be the attaching map
for , where is the -skeleton of . Then let be the natural projection
Let . Now, is a (n-1)-sphere, so the map has a degree which we use to define the boundary operator:
The resulting chain complex is called the cellular chain complex.
Theorem 1
The homology of the cellular complex is the same as the singular homology of the space. That is
Cellular homology is tremendously useful for computations because the groups involved are finitely
generated.
Title | cellular homology |
---|---|
Canonical name | CellularHomology |
Date of creation | 2013-03-22 13:14:55 |
Last modified on | 2013-03-22 13:14:55 |
Owner | bwebste (988) |
Last modified by | bwebste (988) |
Numerical id | 6 |
Author | bwebste (988) |
Entry type | Definition |
Classification | msc 55N10 |