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[en] Two different scenarios (light-front and equal-time) are possible for Yang-Mills theories in two dimensions. The exact q-barq-potential can be derived in perturbation theory starting from the light-front vacuum, but requires essential instanton contributions in the equal-time formulation. In higher dimensions no exact result is available and, paradoxically, only the latter formulation (equal-time) is acceptable, at least in a perturbative context
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