Give an example of function which is continuous on every rational points and discontinuous on irrational points?
Function continuous on every rational points but discontinuous on irrational points
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real-analysis
continuity
examples-counterexamples
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0Good luck with this one! :) – 2017-01-21
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0see also http://math.stackexchange.com/questions/993770/does-there-exist-a-function-that-is-continuous-at-every-rational-point-and-disco – 2017-01-21