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We show that the first homology group of a locally connected compact metric space is either uncountable or finitely generated. This is related to Shelah's well-known result (1988) which shows that the fundamental group of such a space satisfies a similar condition. We give an example of such a space whose fundamental group is uncountable but whose first homology is trivial, showing that our result does not follow from Shelah's. We clarify a claim made by Pawlikowski (1998) and offer a proof of the clarification.
Gregory R. Conner, and Samuel M. Corson. "On the first homology of Peano continua." Fundamenta Mathematicae 232.1 (2016): 41-48. <http://eudml.org/doc/283390>.
@article{GregoryR2016, abstract = {We show that the first homology group of a locally connected compact metric space is either uncountable or finitely generated. This is related to Shelah's well-known result (1988) which shows that the fundamental group of such a space satisfies a similar condition. We give an example of such a space whose fundamental group is uncountable but whose first homology is trivial, showing that our result does not follow from Shelah's. We clarify a claim made by Pawlikowski (1998) and offer a proof of the clarification.}, author = {Gregory R. Conner, Samuel M. Corson}, journal = {Fundamenta Mathematicae}, keywords = {fundamental group; homology group; Polish space; analytic relation}, language = {eng}, number = {1}, pages = {41-48}, title = {On the first homology of Peano continua}, url = {http://eudml.org/doc/283390}, volume = {232}, year = {2016}, }
TY - JOUR AU - Gregory R. Conner AU - Samuel M. Corson TI - On the first homology of Peano continua JO - Fundamenta Mathematicae PY - 2016 VL - 232 IS - 1 SP - 41 EP - 48 AB - We show that the first homology group of a locally connected compact metric space is either uncountable or finitely generated. This is related to Shelah's well-known result (1988) which shows that the fundamental group of such a space satisfies a similar condition. We give an example of such a space whose fundamental group is uncountable but whose first homology is trivial, showing that our result does not follow from Shelah's. We clarify a claim made by Pawlikowski (1998) and offer a proof of the clarification. LA - eng KW - fundamental group; homology group; Polish space; analytic relation UR - http://eudml.org/doc/283390 ER -