anonanon 152k1212 gold badges233233 silver badges398398 bronze badges $endgroup$ 4 $begingroup$ That is best many thanks a bunch! I also posted an analogous question here: math.stackexchange.com/issues/2135276/… that you might have some insight on? $endgroup$The Levi-Civita image is most often used in three and four Proportions, also to some exte