Sought-after ballpoint signature, "Richard Feynman,” with one of his famous 'Feynman diagrams' below, on an off-white 5.5 x 3.5 card. In fine condition, with light corner creases. Feynman diagrams, named after their inventor, are pictorial representations of the mathematical expressions describing the behavior of subatomic particles. An appealing example of a decidedly scarce autograph.
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