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- Stuart A. Rankin
- 2009

In 1962, R. C. Lyndon and M. P. Shutzenberger established that for any positive integers r and s, any sequence of length at least r + s that is both r-periodic and s-periodic is then (r, s)-periodic. Shortly thereafter (1965), N. J. Fine and H. S. Wilf proved that for any positive integers r and s, if a is an infinite seqeunce of period r and b is an… (More)

- ORTHO FLINT, Stuart A. Rankin
- 2007

- Stuart A. Rankin
- Words, Semigroups, and Transductions
- 2001

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