دانلود کتاب Proceedings of the International Conference on Semigroups : Braga, Portugal, 18-23 June 1999

The monograph summarizes recent achievements in the calculation of matrix elements of local operators (form factors) for completely integrable models. In particular, it deals with sine-Gordon, chiral Gross-Neven and O(3) nonlinear s models. General requirements on form factors are formulated and explicit formulae for form factors of most fundamental local operators are presented for the above mentioned models Inverse transversals - a guided tour, T.S. Blyth; deciding some embeddability problems for semigroups of mappings, D.H. Fremlin and P.M. Higgins; introduction to E-inversive semigroups, H. Mitsch; rings graded by inverse semigroups, W.D. Munn; varieties of bands, M. Petrich; transformation semigroups - past, present and future, R.P. Sullivan; the finite basis problem for finite semigroups - a survey, M.V. Volkov. (Part contents)