A f is called Hamel function if its graph is a Hamel basis of the linear space R² over rationals. We construct, assuming CH, a free group of the size 2ᶜ contained in the class of all Hamel functions, with the indentity function included. This answers, consistently, a question posed recently by M. Lichman, M. Pawlikowski, S. Smolarek, and J. Swaczyna.
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Tomasz Natkaniec (2024) studied this question.
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