Foran, James Bounded variation and porosity. (English) Zbl 0649.26008 Real Anal. Exch. 12(1986/87), 468-477 (1987). The author [same journal 11, 194-203 (1986; Zbl 0607.26005)] has found an example of a continuous function, the graph of which is not sigma porous. In this paper there are examples of functions of bounded variation (even absolutely continuous) which have a c-dense (continuum dense) set of points of non-porosity of the graph. The question whether functions of bounded variation must have sigma porous graphs remains open. Reviewer: W.Wilczyński MSC: 26A45 Functions of bounded variation, generalizations 26A46 Absolutely continuous real functions in one variable Keywords:examples of functions of bounded variation; set of points of non-porosity of the graph Citations:Zbl 0607.26005 PDF BibTeX XML Cite \textit{J. Foran}, Real Anal. Exch. 12, 468--477 (1987; Zbl 0649.26008) OpenURL