y**t
发帖数: 50 | 1 I think here s/he refers to the so called "doubly connected domain"
in complex analysis,am I right?If so,it just means how manys holes
in the domain.Doubly connected contains a hole,multiply connected
contain more, etc.
In algebraic topology,it's called n-connectedness just as visionc said,
the lower homotopy groups are zero. |
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