Dirichlet Function

The Dirichlet Function is not continuous at any point on the real line.

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Proof:

Left as Exercise. Show that g can not be continuous at a rational number by considering sequences of irrational numbers. Then show that g can not be continuous at an irrational number by considering sequences of rational numbers.


Interactive Real Analysis, ver. 1.9.5
(c) 1994-2007, Bert G. Wachsmuth
Page last modified: Mar 28, 2007