В дополнение к #ggtgo

http://en.wikipedia.org/wiki/Topological...
Topological spaces are mathematical structures that allow the formal definition of concepts such as convergence, connectedness, and continuity. They appear in virtually every branch of modern mathematics and are a central unifying notion. The branch of mathematics that studies topological spaces in their own right is called topology.

То ли дело английская...

#ggtgf

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