Christos Papakyriakopoulos
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Ralph Fox
Alternating knot
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Harold W. Kuhn
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Alexander polynomial
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Lusternik–Schnirelmann category
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Compact-open topology
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Michael Freedman
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Braid group
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Solomon Lefschetz
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Knot theory
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John Milnor
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R. H. Fox
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R.H. Fox
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