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I am unsure whether it should be a subcategory. Yes, it does use techniques from QFT, but it is not really itself a QFT topic. Honestly, after much back and forth about it, I think I'll reinstate it as a category after having undone this. But if anyone else has a view on this, let me know.OpenScience709 (talk) 13:50, 30 April 2022 (UTC)[reply]