anonanon 152k1212 gold badges233233 silver badges398398 bronze badges $endgroup$ 4 $begingroup$ That is great many thanks a bunch! I also posted the same problem in this article: math.stackexchange.com/issues/2135276/… that You could have some Perception on? $endgroup$The importance of Levi-Civita Qualities in four dimensions lies in their functi