Abstract
This paper has no connection with the two papers jointly authored by Paul Erdős and myself; nor does it overlap any of the many conversations we had. But I feel it is appropriate to dedicate the paper to him. It has the flavor of the mathematics we both particularly enjoyed: very explicit problems challenging us to answer “yes” or “no”.
I. Kaplansky (Deceased)
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Kaplansky, I. (2013). Integers Uniquely Represented by Certain Ternary Forms. In: Graham, R., Nešetřil, J., Butler, S. (eds) The Mathematics of Paul Erdős I. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7258-2_4
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