Retraction (topology)
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Witold Hurewicz
Homotopy groups of spheres
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Hans Hahn (mathematician)
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Edward Marczewski
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Paul Erdős
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Hurewicz theorem
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Eckmann–Hilton argument
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Limit cycle
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Z-transform
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List of Polish people
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Karl Menger
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Mathematical analysis
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Algebraic topology
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September 6
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June 29
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Hurewicz
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