Re:Homology
by knzhou on Friday November 15, 2019 @06:34PM
(#21549807)
A closed curve could be the boundary of something, but it has no boundary itself. The boundary of an open curve is its endpoints, a closed curve has no endpoints.
It's important to distinguish having a boundary vs. being the boundary of something, since in some sense the difference between the two is the whole point of homology.
It's important to distinguish having a boundary vs. being the boundary of something, since in some sense the difference between the two is the whole point of homology.