ABSTRACT
Lorentz, Einstein and Poincaré considered the speed of the arbitrary point P to be the light speed when they determined the scaling factors α and λ. Consequently, the strict Lorentz transformations (7.12), (7.15), (7.20) through (7.23), and Lorentz transformations (7.20) through (7.23) are partially (rather than completely) pairwise compatible, i.e. they are pairwise compatible if and only if the arbitrary point P moves with the speed of light. This is the origin of the partial compatibility.
