Triangle group
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Walther von Dyck
Schwarz triangle
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Dyck language
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Combinatorial group theory
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Geometric group theory
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Jonathan Zenneck
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Axiomatic system
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Presentation of a group
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List of Germans
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Free group
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Felix Klein
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Surface (topology)
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November 5
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Johannes Kepler
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Walter Van Dyck
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Walther Franz Anton von Dyck
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