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The phenomenological Lagrangian approach to the current-field algebra, and its advantages and defects, are discussed. The computational rules are stated, and justification is offered. Based on the phenomenological field-algebra Lagrangian, we consider the electromagnetic effects on the pion mass (for finite pion mass), the ρ-meson mass, and the pion β decay.
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Lee et al. (1968) studied this question.
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