 A key problem with Ramsey-sentence realism is that though a Ramsey-sentence of a theory may be empirically inadequate, and hence false, if it is empirically adequate (if, that is, the structure of observable phenomena is embedded in one of its models), then it is bound to be true. For, as Max Newman (1928) first noted in relation to Russell’s (1927) structuralism, given some cardinality constraints, it is guaranteed that there is an interpretation of the variables of \(^{R}T\) in the theory’s intended  domain.[9]