We define and study, for subsets of \([0, \infty),\) several types of strong right upper porosity at the point 0. Some characterizations of these types of porosity are obtained, including a characterization in terms of a universal property and a characterization in terms of a structural property.
"Investigations of Strong Right Upper Porosity at a Point." Real Anal. Exchange 39 (1) 175 - 206, 2013/2014.