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108.19 Countable lists of rational numbers by removing digits

Published online by Cambridge University Press:  23 August 2024

Richard Kaufman
Richard Kaufman*
Affiliation:
Office Expander (www.OfficeExpander.com) North Andover, MA, USA e-mail: rdkaufman01@gmail.com
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The Mathematical Gazette , Volume 108 , Issue 572 , July 2024 , pp. 311 - 313
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© The Authors, 2024 Published by Cambridge University Press on behalf of The Mathematical Association

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References

Courant, R., Robbins, H. and Stewart, I., What is Mathematics?: An elementary approach to ideas and methods, Oxford University Press (1996) pp. 79–80.Google Scholar
Subramaniam, K., A new proof that the rationals are countable. Math. Gaz. 98 (July 2014) p. 345.CrossRefGoogle Scholar
HomeSchoolmath.net. (n.d.). An easy proof that rational numbers are countable. Retrieved August 20, 2022, from https://www.homeschoolmath.net/teaching/rational-numbers-countable.phpGoogle Scholar