Feynman Diagram

http://www.bbc.co.uk/programmes/b00ts5mm

http://www.bbc.co.uk/archive/feynman/10700.shtml



The Feynman Variations
By Hamish Johnston at:
http://physicsworld.com/blog/2010/09/the_feynman_variations.html

The BBC has a wealth of archive material at its disposal – everything from Led Zeppelin performances to television programmes featuring the late physicist Richard Feynman.
The latter was featured earlier this week on the BBC Radio 4 show The Archive Hour, presented by particle physicist and media darling Brian Cox.
“As curious as he was clever”, is how Cox describes Feynman. In an archive recording, Hans Bethe calls Feynman “a magician”.
Feynman (1919–1988) is widely celebrated as the greatest physicist of his generation – the first generation after the founding of quantum mechanics.
Heisenberg, Shrödinger and Dirac were a tough act to follow, but Feynman did so with remarkable flair. He developed the path integral formulation of quantum mechanics, shared the 1965 Nobel prize for his work on quantum electrodynamics, and brought us Feynman diagrams...

more at:
http://physicsworld.com/blog/2010/09/the_feynman_variations.html









http://en.wikipedia.org/wiki/Feynman_diagram

In theoretical quantum physics, a physical quantity —like a scattering cross section —is often calculated using the so-called perturbation theory, where the quantity is represented as an infinite series, that is, a sum of ever decreasing terms. A Feynman diagram is an intuitive graphical representation of a term in this series.

links:
http://www2.slac.stanford.edu/vvc/theory/feynman.html