original_query: What are the major contributions made by Frank Plumpton Ramsey in the fields of philosophy, mathematics, and economics?
query: What are the major contributions made by Frank Plumpton Ramsey in the fields of philosophy, mathematics, and economics?
answer: In mathematics, Ramsey is known for Ramsey's theorem and his simplification of the Theory of Types.  In philosophy, he's noted for his work on the redundancy theory of truth, a reliabilist theory of knowledge, and a subjective interpretation of probability. In economics, his major contributions include papers on subjective probability and utility, optimal taxation, and optimal economic growth (the Ramsey model).