MINKOWSKI'S FOUR - DIMENSIONAL SPACE
("WORLD") [Supplementary to Section XVII]
(I2)
That is, by the afore-mentioned choice of " co-ordinates," (IIa) is transformed into this equation.
We see from (I2) that the imaginary time co-ordinate x4 enters into the condition of transformation in exactly the same way as the space co-ordinates x1, x2, x3.It is due to this fact that, according to the theory of relativity, the " time " x 4 enters into natural laws in the same form as space co-ordinates x1, x2, x3.
A four dimensional continuum described by the " co-ordinates " x1, x2, x3, x4, was called " world " by Minkowski, who also termed point-event a " world-point. " From a " happening " in three dimensional space, physics becomes, as it were, an " existence " in the four dimensional " world. "
This four dimensional " world " bear a close similarity to the three dimensional " space " of (Euclidean) analytical geometry. If we introduce into the latter a new Cartesian co-ordinate system (x'1, x'2, x'3) with the same origin, then system x'1, x'2, x'3 are linear homogeneous functions of x1, x2, x3, which identically satisfy the equation
The analogy with (I2) is a complete one. We can regard Minkowski's " world " in a formal manner as a four dimensional Euclidean space (with imaginary time co-ordinate) ; the Lorentz transformation corresponds to a " rotation " of the co-ordinate system in the four dimensional "world. "
So many of you have been logging straight to this piece, that we decided to move it into the new stuff where it is more easily accessible, and add a bit more of the math, because that's obviously what you're after.
This added math will be used later [hopefully] to show:
So, we will keep trying to translate this into plain English that the general public can understand. Any suggestions are more than welcome, but in the meantime, heres a headstart on forthcoming virtual chaos...
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