Duchamp, G.H.E.; Blasiak, P.; Penson, K.A. and Solomon, A.I.
Feynman graphs and related Hopf algebras.
Journal of Physics: Conference Series, 30 pp. 107–118.
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In a recent series of communications we have shown that the reordering problem of bosons leads to certain combinatorial structures. These structures may be associated with a certain graphical description. In this paper, we show that there is a Hopf Algebra structure associated with this problem which is, in a certain sense, unique
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