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The 1/N-expansion as a perturbation about the mean field theory: A one-dimensional fermi model

✍ Scribed by D. H. U. Marchetti; P. A. Faria da Veiga; T. R. Hurd

Publisher
Springer
Year
1996
Tongue
English
Weight
976 KB
Volume
179
Category
Article
ISSN
0010-3616

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## Abstract We show that to the order $O \big ( {1 \over N} \big )$ included all __n__‐point functions can be expressed by the propagator of the Ξ± field and an insertion of the order ${1 \over N}$ 4‐point function of Ξ±, which is a simple algebraic function.