What ideas did Rudolf Carnap develop in Meaning and Necessity?

In Meaning and Necessity (1947), Rudolf Carnap furthered his project of resolving philosophical perplexities through the logical analysis of language. He argued that technical issues in fields like the philosophy of science and mathematics require clarification using artificially constructed languages, which are formulated in logical symbolism and governed by precise syntactic and semantic rules.1

The work is a significant contribution to intensional logic, which deals with the meanings of linguistic expressions—such as propositions and individual concepts—rather than just their referents. By employing formal systems, Carnap sought to provide a rigorous framework for understanding modality, including concepts like necessity and possibility. His approach emphasized that philosophical clarity is best achieved by specifying the structure and interpretation of language through formal, symbolic means, rather than relying on ordinary linguistic usage.1