 As Royce explains, “The \(F\)-relation, so long as ‘obverses’ or ‘negatives’ exist, follows immediately from, and is equivalent to, an \(O\)-relation. For, in the diagram [above] if \(s\) is the total surface in which \(a\), \(b\), and \(c\) are included, then when ‘\(c\) is between \(a\) and \(b\),’ ‘\(a\), \(b\), and \(\neg c\) (\(\neg c\) being the obverse of \(c\)) constitute an \(O\)-collection,’ or ‘are in the \(O\)-relation’ ” (Royce 1905, 387).