The answer to exercises marked [BB] can be found in the Back of the Book.
(a) [BB] Prove that the intervals (0. 1) and (1, 2) have the same cardinality.
(b) Prove that (0, 1) and (4, 6) have the same cardinality.
(c) Prove that any two open intervals (a, b)and (c, d)have the same cardinality.
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