19. Let I = (R \ Q)n(0, 1] and Q = Qn[0,1], with their usual metrics. Prove that there is a continuous map from I onto Q, but that there does not exist a continuous map from [ 0, 1] onto Q. [Hint: Given a sequence of rationals 0 = ro < n<..

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19. Let I = (R \ Q) n [0, 1] and Q = Qn[0, 1 ], with their usual metrics.
Prove that there is a continuous map from I onto Q, but that there does not exist a
continuous map from [ 0, 1] onto Q. [Hint: Given a sequence of rationals 0= ro <
n <... < rn < 1 increasing to 1, notice that I can be written as the disjoint union
of the open sets (rn-1, rn) n[0, 1 ], n = 1, 2, ...]
%3D
Transcribed Image Text:19. Let I = (R \ Q) n [0, 1] and Q = Qn[0, 1 ], with their usual metrics. Prove that there is a continuous map from I onto Q, but that there does not exist a continuous map from [ 0, 1] onto Q. [Hint: Given a sequence of rationals 0= ro < n <... < rn < 1 increasing to 1, notice that I can be written as the disjoint union of the open sets (rn-1, rn) n[0, 1 ], n = 1, 2, ...] %3D
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