1905 - Einstein involved negative time in* SRT
( nobody knew what negative time really was)
1908 - Minkowski* said that Einstein's* equations look ''ugly''
And he gave beautiful mathematical* solution changing
Einstein's ''ugly'' negative time into a positive time.
Minkowski* explained his solution as a* ''space-cone''
Today professors say to students:
''you cannot be physicists if you don't understand* Minkowski's
beautiful mathematical solution''*
( but nobody explains* what ''space-cone''* or 4-D* really is )
Then in 1919* Kaluza and* O.Klein* involved* 5-D
And* in 1969* ''string''- physicists involved 11-D, 27-D, M-D*
These* super - D* have never been observed, but physicists believe
that they are on the right way
You cannot do more complex arithmetic if you don't know what* 2+2 = 4
and if you don't know what 4-D really* is,* then more complex dimensions
are only* mathematical play for mathematicians
a) Classic view: dimension = direction
There are Descartes' three dimensions in space as
three directions in space. The point where all directions
are united shows place where object is.
We don't need more dimension, 3-D is enough to solve problem.
Looking on watch we know at what time object was in this point.
b) Minkowskki view:
there are four dimensions in space as four direction in space
but this ''space'' is not ordinary but very specific '' an absolute spacetime''.
In this ''absolute spacetime'' we don't know the point and time
where object is exactly.