Anonanon 152k1212 gold badges233233 silver badges398398 bronze badges $endgroup$ 4 $begingroup$ That's excellent many thanks a bunch! I also posted a similar question right here: math.stackexchange.com/concerns/2135276/… that You could have some insight on? $endgroup$ The significance of Levi-Civita properties in four dimensions lies in their role in the mathematical description https://chaplind790yvs9.tnpwiki.com/user