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In scattering theory, a part of mathematical physics, the Dyson series, formulated by Freeman Dyson, is a perturbative expansion of the time evolution operator in the interaction picture. Each term can be represented by a sum of Feynman diagrams .
Freeman John Dyson FRS (15 December 1923 – 28 February 2020) [1] was a British-American theoretical physicist and mathematician known for his works in quantum field theory, astrophysics, random matrices, mathematical formulation of quantum mechanics, condensed matter physics, nuclear physics, and engineering.
Launch year Description DC65/UP13/DC66 no image: 2014 The DC65 (DC66 in Canada)—is an update of the DC41. The vacuum features an updated root cyclone and a redesigned brush roll with more power than the DC41 and a better edge cleaning system. Some variants (like the Animal model) include the Tangle-Free Turbine Tool.
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Freeman Dyson in 2005 Astrochicken is the name given to a thought experiment expounded by theoretical physicist Freeman Dyson . An Astrochicken is a small, one-kilogram spacecraft , a self-replicating automaton that could explore space more efficiently than a crewed craft could due to its innovative mix of technology.
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An Alderson disk [1] [2] (named after Dan Alderson, its originator) is a hypothetical artificial astronomical megastructure, like Larry Niven's Ringworld and the Dyson sphere. The disk is a giant platter with a thickness of several thousand miles. The Sun rests in the hole at the center of the disk.