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Aug 2, 2021 at 17:47 comment added Bjørn Kjos-Hanssen Lemma 4 of the 2nd paper concerns a closely related operation.
Aug 2, 2021 at 17:35 vote accept Bjørn Kjos-Hanssen
Aug 2, 2021 at 16:45 comment added Bjørn Kjos-Hanssen Fantastic thanks @Arno
Aug 2, 2021 at 13:01 history answered Arno CC BY-SA 4.0