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Questions that are about research in mathematics, or about the job of a research mathematician, without being mathematical problems or statements in the strictest sense. Do not use this tag for easy or supposedly easy mathematical questions.

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increasing bijection

Using the back-and-forth method we can construct an increasing bijection from the set of rational numbers to the set of of rational numbers except zero. http://en.wikipedia.org/wiki/Back-and-forth_me …
Manuel Silva's user avatar