"My fundamental idea is that the 'logical constants' are not representatives; that there can be no representatives of the logic of facts." (4.0312)

"Logical constants" are the objects used in the logical schematization of propositions to tie the elements of those propositions together. There are truth-functional constants like "and" or "not" as well as constants to express generality ("for every..." and "there exists a...") and constants to express sets and membership of sets. Wittgenstein argues that these constants do not signify anything (e.g. there is no such thing as negation, represented by the symbol "~"), and shows that they are unnecessary to logical schematization. This argument contradicts Frege and Russell, who introduced logical constants as essential parts of their axiomatic systems. This idea is significant because it reflects Wittgenstein's view of logic as being structural and without content. There are no logical propositions, and there is no body of objects, ideas, or thoughts that we can define as "logical."