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I think that QFT and the string theory have the following flaw in common: they treat perturbatively coupling the things coupled permanently. This is a conceptual flaw that not always can be "repaired" not in all cases.

I think that QFT and the string theory have the following flaw in common: they treat perturbatively coupling the things coupled permanently. This is a conceptual flaw that can be "repaired" not in all cases.

I think that QFT and the string theory have the following flaw in common: they treat perturbatively coupling the things coupled permanently. This is a conceptual flaw that not always can be "repaired".

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I think that QFT and the string theory have the following flaw in common: they treat perturbatively coupling the things coupled permanently. This is a conceptual flaw that can be "repaired" not in all cases.