mint; multicolored; American Scientists; Richard Feynman, physicist; stamp has Feynman Diagrams; reddish background; verso of pane says, "Richard P. Feynman / (1918-1988) / developed a new formulation ...
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Illustration of a polaron in a crystal: the central bright sphere is the charge carrier, distorting the surrounding lattice. The wavy lines represent high-order Feynman diagrams for the ...
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