Let $f\colon \mathbb R\to\mathbb R$ and let $D_f$ denote the set of points of discontinuity of $f$. First it is proved that if $f|_{D_f}$ is continuous, then $D$ is a nowhere dense, $F_\sigma$ set. The major result is that if $D$ is a nowhere dense, $F_\sigma$ set then there is a function $f$ such that $D_f=D$ and $f|_D$ is continuous. Finally it is shown that such functions are of Baire class one.
Real Anal. Exchange
49(1):
235-240
(2024).
DOI: 10.14321/realanalexch.49.1.1686207848
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