Abstract
We strengthen previous results on the fundamental groups of the Hawaiian earring and wild Peano continua. Let $X$ be a path-connected, locally path-connected, first countable space which is not locally semi-simply connected at any point. If the fundamental group $\pi_1(X)$ is a subgroup of a free product $*_{j \in J}H_j$, then it is contained in a conjugate subgroup to some $H_j$.
Citation
Katsuya EDA. "Atomic property of the fundamental groups of the Hawaiian earring and wild locally path-connected spaces." J. Math. Soc. Japan 63 (3) 769 - 787, July, 2011. https://doi.org/10.2969/jmsj/06330769
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