If I define a constant function on domain of rationals, then is it the right chosen function to be continuous at rationals? Also is there any function with Domain of reals which is continuous on rationals?
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1https://math.stackexchange.com/questions/67620/set-of-continuity-points-of-a-real-function have a look. – Rick Aug 01 '19 at 16:16
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This question has been asked many times on this site...the duplicate I linked to is itself a duplicate. – lulu Aug 01 '19 at 16:18
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This question is now marked as a duplicate of a duplicate of a duplicate! I've never seen that happen before. – Tanner Swett Aug 01 '19 at 16:54
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Do you know Baire's category theorem? – Anil Bagchi. Aug 08 '20 at 07:58