Identities for Whitehead products and infinite sums
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909986926362624 |
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| author | Brazas, Jeremy |
| author_facet | Brazas, Jeremy |
| contents | Whitehead products and natural infinite sums are prominent in the higher homotopy groups of the $n$-dimensional infinite earring space $\mathbb{E}_n$ and other locally complicated Peano continua. In this paper, we derive general identities for how these operations interact with each other. As an application, we consider a shrinking wedge $X$ of finite $(n-1)$-connected CW-complexes $X_1,X_2,X_3,\dots$ and compute the infinite-sum closure $\mathcal{W}_{2n-1}(X)$ of the set of Whitehead products $[α,β]$ in $π_{2n-1}\left(X\right)$ where $α,β\inπ_n(X)$ are represented in respective sub-wedges that meet only at the basepoint. In particular, we show that $\mathcal{W}_{2n-1}(X)$ is canonically isomorphic to $\prod_{j=1}^{\infty}\left(π_{n}(X_j)\otimes \prod_{k>j}π_n(X_k)\right)$. The insight provided by this computation motivates a conjecture about the isomorphism type of the elusive groups $π_{2n-1}(\mathbb{E}_n)$, $n\geq 2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_10430 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Identities for Whitehead products and infinite sums Brazas, Jeremy Algebraic Topology 55Q15, 55Q52, 55Q35, 08A65 Whitehead products and natural infinite sums are prominent in the higher homotopy groups of the $n$-dimensional infinite earring space $\mathbb{E}_n$ and other locally complicated Peano continua. In this paper, we derive general identities for how these operations interact with each other. As an application, we consider a shrinking wedge $X$ of finite $(n-1)$-connected CW-complexes $X_1,X_2,X_3,\dots$ and compute the infinite-sum closure $\mathcal{W}_{2n-1}(X)$ of the set of Whitehead products $[α,β]$ in $π_{2n-1}\left(X\right)$ where $α,β\inπ_n(X)$ are represented in respective sub-wedges that meet only at the basepoint. In particular, we show that $\mathcal{W}_{2n-1}(X)$ is canonically isomorphic to $\prod_{j=1}^{\infty}\left(π_{n}(X_j)\otimes \prod_{k>j}π_n(X_k)\right)$. The insight provided by this computation motivates a conjecture about the isomorphism type of the elusive groups $π_{2n-1}(\mathbb{E}_n)$, $n\geq 2$. |
| title | Identities for Whitehead products and infinite sums |
| topic | Algebraic Topology 55Q15, 55Q52, 55Q35, 08A65 |
| url | https://arxiv.org/abs/2408.10430 |