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Summary

In this article we prove the following result. If a function defined on an interval has a finite one-sided limit at each point of a dense subset of the interval, then the set of points where the function is continuous is dense in the interval and uncountable. Our proof is accessible to undergraduate students.

Additional information

Notes on contributors

Julie Millett

Julie Millett () received her M.S. from Missouri State University. She teaches mathematics part time at Crowder College. Her proudest accomplishment is family life: six children, three currently living at home, three married, five grandchildren. She enjoys doing volunteer community service. She currently serves as president of a local church youth group and a Cub Scout leader.

Xingping Sun

Xingping Sun () received his Ph.D. from the University of Texas at Austin. He has been a professor of mathematics (of various types) at Missouri State University since 1990. His research interest lies in areas of approximation theory and classical analysis. Although his main hobby is reading science fictions, his favorite activity is playing competitive tennis. By a large margin, he has lost more tennis matches than debunked mathematical conspiracies.

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