Anonanon 152k1212 gold badges233233 silver badges398398 bronze badges $endgroup$ four $begingroup$ That is great many thanks a bunch! I also posted the same problem in this article: math.stackexchange.com/queries/2135276/… that You may have some insight on? $endgroup$ The Levi-Civita image is most often used in a few and 4 dimensions, and https://juliam581lyg4.angelinsblog.com/profile