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topology
by katya ejkova
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topology

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degree

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explain how used to compute pi1

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calculate

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angle function

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space

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hausdorf

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topology

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connected

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path connected

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metric

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contractible

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subsets

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open set

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open ball

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map

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homotopy

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homeomorphism

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continuous map

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path

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fundamental group

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detailed definition

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calculate using degree, eg for torus

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winding number

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