 One could identify Russellian monism with the conjunction of all three core theses, where each thesis could be explicated in different ways, resulting in different varieties of the theory (see sections  1.2  and  4).  For present purposes, that characterization will suffice. (But see below; and for an alternative characterization, see Pereboom 2011: 89; cf. Alter and Nagasawa 2012: 71–72.)