Re: Union of disks forms a sphere
- From: rusin@xxxxxxxxxxxxxxxxxxxxx (Dave Rusin)
- Date: 20 Feb 2006 15:55:57 GMT
In article <bkcjv11t57plhr1pcltstqal6p0l6r77k7@xxxxxxx>,
Toni Lassila <tlassila@xxxxxxxxx> wrote:
How to prove formally without resorting to Euler characteristics that
if the intersection of two 2-disks is exactly the boundary circle of
each, then their union is a 2-sphere?
How about using the definition of "homeomorphism" ?
dave
.
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