Rudolf Haag
Rudolf Haag (born 17 August 1922 in Tübingen, Germany) is a German physicist. He is best known for his contributions to the algebraic formulation of axiomatic quantum field theory, namely the Haag-Kastler axioms , and a central no-go theorem in QFT, Haag\'s theorem, which demonstrates the nonexistence of a unitary[disambiguation needed ] time-evolution operator in the interaction picture.
