Abstract

We investigate conditions under which a map f in a possibly non-compact interval is acyclic— the only periodic orbits are fixed points. Several earlier results are generalized to maps with multiple fixed points. The chief tools are convergence results due to Coppel and Sharkovski, and the Schwarzian derivative. Illustrative examples are given and open problems are suggested. He who can digest a second or third fluxion . . . need not, methinks, be squeamish about any point in divinity. ―Bishop George Berkeley, “The Analyst,” 1734

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