Edward Witten has stated that QFT is not mathematically rigorous, and that string theory helps us in unifying the forces much better. Can you give me a suitable example in which QFT lacks mathematical rigour?
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4Have you checked this question https://physics.stackexchange.com/q/6530/ – joseph h Sep 08 '20 at 08:06
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Yeah that is what I was looking for. Thanks! – Physiker Sep 08 '20 at 08:25
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Girdar Your welcome! – joseph h Sep 08 '20 at 23:04