It is in heavy dispute in the literature whether Frege's conception of logic is universalism
and excludes the possibility of metalogical investigations. In the book the author argues that
there is indeed tension between universalism and non-universalism in it which finds expression
in Grundgesetze. It dismisses the notion of reinterpretation playing a crucial role in the
post-Tarskian metalogical investigations as illegitimate for a language in which a theory
whose subject matter is thoughts rather than formulae per se is formulated must not be
reinterpreted in that fully interpreted formulae express different thoughts once reinterpreted.
However it does not preclude such metalogical investigations that do not make use of the
notion: they are not only legitimate understandable to it but also indispensable to Frege's
logicist project.
