Carl Ludwig Siegel
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What links here
Max Dehn
Low-dimensional topology
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Heinz Hopf
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Cayley graph
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1900 in science
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Dehn invariant
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Black Mountain College
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Wallace–Bolyai–Gerwien theorem
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Hilbert's problems
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Knot theory
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Hilbert's third problem
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Free group
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Word problem for groups
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Polyhedron
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November 13
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June 27
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Diffeomorphism
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David Hilbert
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Cube
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