Abstract
The effective field theory formalism is reviewed. A general algorithm for constructing an effective lagrangian involving only light particles out of a renormalizable theory of light and heavy particles is stated. Strong interaction corrections are easily integrated into the formalism. As an example of its use, corrections Δϱ to the weak interactions ϱ parameter due to heavy particles are studied and the Einhorn-Jones-Veltman conjecture on the positivity of Δϱ is revisited.
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