| 11. | Las Vegas isn't the only place where combinatorics mavens gravitate.
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| 12. | He was the leading mathematician in combinatorics for three decades,
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| 13. | Fibonacci numbers is the basic example of a problem in enumerative combinatorics.
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| 14. | It is a special case of a more general object in combinatorics.
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| 15. | Ramsey's theorem is a foundational result in combinatorics.
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| 16. | It is this bit of combinatorics which inspires the Euler product formula.
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| 17. | He also influenced Christian Kramp's work in combinatorics.
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| 18. | Steiner also made a small but important contribution to combinatorics.
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| 19. | His main area of research was combinatorics, particularly in graph theory.
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| 20. | These two characterizations provide a " dictionary " between combinatorics and algebra.
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