References

1. John Cowles & Ruben Gamboa (2014): Equivalence of the Traditional and Non-Standard Definitions of Concepts from Real Analysis. In: Freek Verbeek & Julien Schmaltz: Proceedings of the Twelfth International Workshop of the ACL2 Theorem Prover and its Applications (ACL2-2014), Vienna, Austria, pp. 89–100, doi:10.4204/EPTCS.152.8.
2. William Dunham (1999): Euler: The Master of Us All. Mathematical Association of America.
3. Ruben Gamboa (1999): Mechanically Verifying Real-Valued Algorithms in ACL2. University of Texas at Austin.
4. Edward Nelson (1977): Internal Set Theory: A New Approach to Nonstandard Analysis. Bulletin of the American Mathematical Society 83, pp. 1165–1198, doi:10.1090/S0002-9904-1977-14398-X.
5. (2015): Perfect Number: From Wikipedia, the free encyclopedia. Available at en.wikipedia.org/wiki/Perfect_number.
6. Paul Pollack (2009): Not Always Buried Deep: A Second Course in Elementary Number Theory. American Mathmatical Society.
7. Abraham Robinson (1966): Non-Standard Analysis. North-Holland Publishing Co..

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