“homotopy groups”的概念、定义、翻译、参考文献-科学参考

单词	homotopy groups
释义	homotopy groups [hō`mäd·ǝ·pē ´grüps] ^MATHEMATICS Associated to a topological space X, the groups appearing for each positive integer n, which reflect the number of different ways (up to homotopy) than an n-dimensional sphere may be mapped to X.
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