We study properties of ultramaximally monotone operators. We characterize the interior and the closure of the range of an ultramaximally monotone operator. We establish the Brezis-Haraux condition in the setting of a general Banach space. Moreover, we show that every ultramaximally monotone operator is of type (NA), which generalizes Bauschke and Simons' result.

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L. Yao. “Finer Properties of Ultramaximally Monotone Operators on Banach Spaces.” Journal of Convex Analysis 23 (2016), No. 4, 1205–1218.