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47
votes
Where to build a bridge to cross a river in the shape of an annulus
geometry
optimization
geodesic
asked Oct 12, 2013 at 8:06
math.stackexchange.com
5
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How to prove these two "obvious" facts about circles?
geometry
reference-request
asked Sep 28, 2013 at 22:30
math.stackexchange.com
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