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The Poincare Conjecture | R
In the early 1900s mathematicians and physicists were very interested in the shape of space. New experiments and theories were being developed that would ultimately create relativity theory and change our entire view of the universe.
http://qindex.info/d.php?c=5233#5236

Topology Riddles | R
Topology Riddles | Infinite Series
http://qindex.info/d.php?c=5233#3716

Who cares about topology? | R
(Inscribed rectangle problem)
http://qindex.info/d.php?c=5233#5240
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