| 1. | This has been very important in the study of homotopy groups.
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| 2. | It's for the article Homotopy groups of spheres.
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| 3. | Then, there is an Homology groups as well as homotopy groups.
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| 4. | The history in relation to homotopy groups is interesting.
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| 5. | The cellular approximation theorem can be used to immediately calculate some homotopy groups.
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| 6. | Which is obtained by successively removing ( killing ) homotopy groups of increasing order.
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| 7. | This can then be used to prove the commutativity of the higher homotopy groups.
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| 8. | From relative homotopy groups to relative homology groups.
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| 9. | These groups are called the homotopy groups.
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| 10. | The tower is obtained by successively removing ( killing ) homotopy groups of increasing order.
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