We give a short proof for the theorem that the graph of additive functions is either connected or totally disconnected.
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Dedicated to Prof. Roman Ger on his 70th birthday
The research was supported by the Hungarian National Foundation for Scientific Research (OTKA), Grant No. K111651.
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Székelyhidi, L. Remark on the graph of additive functions. Aequat. Math. 90, 7–9 (2016). https://doi.org/10.1007/s00010-015-0368-9