Inter-universal geometry と ABC予想 (応援スレ) 45

[過去ﾛｸﾞ] Inter-universal geometry と ABC予想 (応援スレ) 45 (1002ﾚｽ)
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283(1): 現代数学の系譜雑談 ◆e.a0E5TtKE 2020/05/08(金)16:52 ID:qXGvfbUV(21/26) AAS
>>281 補足
＞組み合わせ論で、“species”ですか？

（参考）
外部ﾘﾝｸ[html]:pantodon.shinshu-u.ac.jp
Algebraic Topology: A guide to literature 信州大
Species
(抜粋)
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284(2): 現代数学の系譜雑談 ◆e.a0E5TtKE 2020/05/08(金)16:52 ID:qXGvfbUV(22/26) AAS
>>283

つづき

外部ﾘﾝｸ:en.wikipedia.org
Combinatorial species
(抜粋)
In combinatorial mathematics, the theory of combinatorial species is an abstract, systematic method for analysing discrete structures in terms of generating functions. Examples of discrete structures are (finite) graphs, permutations, trees, and so on; each of these has an associated generating function which counts how many structures there are of a certain size.

Category theory provides a useful language for the concepts that arise here, but it is not necessary to understand categories before being able to work with species.
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