A remark on the fact that the Lorentz transformations can be expressed with the help of (finite) differences [Delta’s] in their formula: this is a consequence of the linearity of the transformation. Also related to: Space-time is in a certain sense flat in Special Relativity.

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How can 4 equations be like 4 Galilean moons?

x=x’+vt

y=y’

z=z’

t=t’

These four equations are known collectively as the Galilean transformation.

Four big Jupiter moons (Io, Europa, Ganymede, Callisto) four the big Galilean transformation.