**#1**Aug 3rd, 2018

a)

1905 - Einstein involved negative time in* SRT

( nobody knew what negative time really was)

b)

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 )

c)

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.

=====

*Last edited by socratus; Aug 3rd, 2018 at 07:36 PM..*