| 21. | He also developed the graph theory algorithm known as Prim's algorithm.
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| 22. | This marked the beginning of graph theory as its own branch of mathematics.
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| 23. | He also contributed to topics in graph theory and topology.
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| 24. | His research interest is in discrete mathematics, especially graph theory.
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| 25. | In 1955 Heesch began teaching at University of Hanover and worked on graph theory.
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| 26. | In graph theory, a arborescence and assign an order to all the nodes.
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| 27. | This particular case builds a bridge between time series, dynamical systems and graph theory.
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| 28. | There is a lot of set and graph theory involved.
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| 29. | Rao has guided students for their Ph . D . s in graph theory.
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| 30. | Bhat had guided Ph . D . students in graph theory and combinatorial mathematics.
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