anonanon 152k1212 gold badges233233 silver badges398398 bronze badges $endgroup$ four $begingroup$ That's excellent many thanks a bunch! I also posted the same concern in this article: math.stackexchange.com/concerns/2135276/… that you might have some insight on? $endgroup$The Levi-Civita image is most often used in a few and 4 dimensions, and to