| 11. | This leads to combinatorial game theory as developed by John Horton Conway.
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| 12. | Relays can perform the basic operations of Boolean combinatorial logic.
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| 13. | The methods used in combinatorial chemistry are applied outside chemistry, too.
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| 14. | Combinatorial group theory studies groups from the perspective of generators and relations.
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| 15. | Games like nim also admit a rigorous analysis using combinatorial game theory.
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| 16. | Like many puzzles in recreational mathematics, polyominoes raise many combinatorial problems.
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| 17. | As with most combinatorial notations, the definition is recursive.
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| 18. | The goal of mean field theory is to resolve these combinatorial problems.
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| 19. | Dehn's interests later turned to topology and combinatorial group theory.
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| 20. | This initiated, one could say, the era of combinatorial topology.
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