Abstract
It is shown that form factors calculated within the framework of the Dashen-Frautschi off-the-mass-shell bootsrap method have the same analytical properties as those prescribed by the S-matrix theory, i.e. only unitary cuts are present. The discontinuity calculated along these cuts satisfies the unitarity condition only when certain relations among various coupling constants are fulfilled. Using these relations, the ratios among the isovector magnetic moment of the nucleon, magnetic dipole of the Δ → N + γ transition and isovector magnetic moment of the Δ-resonance are calculated. The results are the same as those following from on the mass-shell bootstrap method and from the Lie group methods of the strong-coupling model.
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