Figure 2
From: Calculation of vectorial derivatives for functions of a quaternion variable and their properties
Figures observed in the direction perpendicular to the xz plane of each graph in Fig. 1. Depending on the range of y, it can be checked which points x will be excluded: (a) graph observed perpendicular to the xz plane with \(x = -10\cdots 10\), \(y = 0\cdots 10\); (b) graph observed perpendicular to the xz plane with \(x = -30\cdots 30\), \(y = 0\cdots 10\)