Suppose that we have some real function of a real variable f defined on the set [a,b] which has the properties that:
1) f takes values in the set on which it is defined
2) for every y∈[a,b] there exists one and only one x∈[a,b] such that f(x)=y.
The question is:
Can such function be everywhere discontinuous?
The question can be asked also in this form:
Does there exist everywhere discontinuous bijection defined on the set [a,b] which also takes values in the set [a,b].
I guess that the answer is yes but at the moment I am not smart enough to prove the existence or to construct such an example.
Thank you for your response and co-operation.
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