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Three numbers is enough to identify the origin of a three dimensional coordinate system. It is not enough to identify the origin of a four dimensional coordinate system.AlMetis said:When I make reference to an inertial frame by its label alone (E, S, A, B etc), I’m refering to its spatial origin x0, y0, z0.
The position of the origin is not enough to specify a coordinate system.
What about the state of motion of the system? What about the angles of its reference axes?
Note that being able to specify ##x_0, y_0## and ##z_0## assumes that you already have another coordinate system already established. If you want a new coordinate system what you want is a transformation rule. Possibly expressed with the use of a coordinate transformation matrix.