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arXiv · 2610.12255

Wedges, Rational completion and $\mathbb Q$-bad spaces

Nikita Golub
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Abstract

Let $A$ and $X$ be connected based CW complexes with $H_1(A;\mathbb Q)\neq 0$, and let $m\geq 1$ be the least degree with $\widetilde H_m(X;\mathbb Q)\neq0$. We prove that the Bousfield--Kan rational completion map of $A\vee X$ induces a map on $H_{2m}(-;\mathbb Q)$ whose cokernel has dimension at least $2^{\aleph_0}$. In particular, $A\vee X$ is $\mathbb Q$-bad.

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Nikita Golub. 2026-10-08. Wedges, Rational completion and $\mathbb Q$-bad spaces. https://arxiv.org/abs/2610.12255

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