[ThirdWorld]

Yet, it is agreed that the 4th Dimension is 'time & motion' ;

*** Time and motion sounds like two things to me. Do you mean 4th and 5th dimensions?

Further a dimension is a fundamental quantity that is independent of all other quantities. However, motion depends on space and time therefore it is not a dimension but can be reduced in every case to its constituent parts.

This in my view is one of the blunders Einstein also made and it has led to the erroneous theory of time dilation: he [ or his advocates] seem/s to be taking the velocity of a photon as equivalent to time so that if you travel as fast as a photon and the photon appears to stand still that to him means that time is standing still.

This is clearly an elementary view and a thinker of a century ago can be pardoned for holding such a view but not thinkers of this modern era: I think better is expected of us.

Actually, I am quite willing to consider math that deals with 5 dimensions: three for space, one time and one matter/ mass. I might even be convinced by math that talks of 11 dimensions if they can show that orientation and location need also to be each defined by three spatial dimensions separate from the three required for size in order to completely describe an object in space.

Anything apart from this has to be false math in my view.

Roger