Abstract
Many mathematical propositions are expressed in terms of a natural number n for which they are either true or false. This expository paper surveys a collection of propositions P(n) which are true if and only if n ≤ 4.
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Cottle, R.W. Quartic Barriers. Computational Optimization and Applications 12, 81–105 (1999). https://doi.org/10.1023/A:1008615713732
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DOI: https://doi.org/10.1023/A:1008615713732