| 1. | The new combinatorial topology formally treated topological classes as abelian groups.
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| 2. | This initiated, one could say, the era of combinatorial topology.
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| 3. | Digital topology is highly related to combinatorial topology.
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| 4. | It should not be confused with combinatorial topology which is an older name for algebraic topology.
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| 5. | Topological-balls are important in combinatorial topology, as the building blocks of cell complexes.
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| 6. | He also first introduced the basic concepts and invariants of combinatorial topology, such as Betti numbers and the fundamental group.
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| 7. | The subsequent spread of homology groups brought a change of terminology and viewpoint from " combinatorial topology " to " algebraic topology ".
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| 8. | Rosenfeld ( 1973 ) proposed digital topology for a type of image processing that can be considered as a new development of combinatorial topology.
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| 9. | He later co-authored, with Max Dehn, a foundational article on combinatorial topology, in the form of an encyclopedia entry.
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| 10. | He worked on the foundations of combinatorial topology, and proposed that a notion of equivalence be defined using only three elementary " moves ".
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