prob015: Schur's lemma
References
Guy, R. K. ``Schur's Problem. Partitioning Integers into Sum-Free Classes'' and ``The Modular Version of
Schur's Problem.'' §E11 and E12 in
Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 209-212, 1994.
Ramsey numbers are closely related, and are described in
prob017.
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