For those users that followed my post of past August 29, I must say that I got a response by a person (by name *Lark 49*) from Maplesoft [to my suspects of a serious bug in MAPLE 13] which response contained ANOTHER way of computing the Riemann tensor, the Ricci tensor and the Riemann scalar curvature, this time using Maple-13's other Package [Differential Geometry] that this time returned a correct response to my quests and serious doubts.

The fact...