Richard Phillips Feynman (/ˈfaɪnmən/; May 11, 1918 –
February 15, 1988) was an American theoretical physicist, known for his
work in the path integral formulation of quantum mechanics, the theory
of quantum electrodynamics, the physics of the superfluidity of
supercooled liquid helium, as well as his work in particle physics for
which he proposed the parton model. For contributions to the development
of quantum electrodynamics, Feynman received
the Nobel Prize in Physics in 1965 jointly with
Julian Schwinger and 'ichirō Tomonaga.
Feynman
developed a widely used pictorial representation scheme for the
mathematical expressions describing the behavior of subatomic particles,
which later became known as Feynman diagrams. During his lifetime,
Feynman became one of the best-known scientists in the world. In a 1999
poll of 130 leading physicists worldwide by the British journal Physics
World, he was ranked the seventh-greatest physicist of all time.
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