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To the memory of Auberon Waugh (1939–2001), a light in the darkness. Abstract Observing the Universe, astronomers have concluded that the motion of stars can not be accounted for unless one assumes(More)
Various Hamiltonian actions of loop groups G and of the algebra diff 1 of first order differential operators in one variable are defined on the cotangent bundle T * G. The moment maps generating the(More)