Thomae's function gives the existance of a function continuous at every irrational number and discontinuous at every rational number. Is there existance of a function that is continuous at every rational and discontinuous at every irrational
2026-03-30 16:04:01.1774886641
existence of a function that is continuous at every rational and discontinuous at every irrational
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Wikipedia knows the answer to that. Read "Follow-up" at https://en.wikipedia.org/wiki/Thomae%27s_function