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In [[quantum field theory]], and especially in [[quantum electrodynamics]], the interacting theory leads to infinite quantities that have to be absorbed in a [[renormalization]] procedure, in order to be able to predict measurable quantities. The renormalization scheme can depend on the type of particles that are being considered. For particles that can travel asymptotically large distances, or for low energy processes, the '''on-shell scheme''', also known as the physical scheme, is appropriate. If these conditions are not fulfilled, one can turn to other schemes, like the [[Minimal subtraction scheme]].
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