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The SL(2,R) invariant Hamiltonian systems are discussed within the framework of the orbit method. It is shown that both the dynamics and the symmetry transformations are globally well-defined on phase space. The flexibility in the choice of the time variable and the Hamiltonian function described in the paper by de Alfaro et al. [Nuovo Cimento 34A (1976) 569] is related to the nontrivial global structure...
The threshold multiparticle amplitudes in Φ 4 theory are analysed from a point of view of renormalization group. The formulae for leading and next-to-leading terms are given.
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