- #1
Gedankenspiel
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Sometimes one can read that constructive QFT has become somewhat superfluous with the advent of effective QFT, so there is no need anylonger to define a QFT on arbitrary small distances.
But is there a rigorous interacting effective QFT in d=4 at all? If so, how is it constructed?
But is there a rigorous interacting effective QFT in d=4 at all? If so, how is it constructed?