NB Einstein actually pondered over to call his theory the theory of the absoute because besides showing that space, time simultaniety, mass (and more) were relative he also showed what was absoulte
e.g. c the velocity of light in vaccum and "distance" in spactime
I don't know the sayings in english but in Sweden many people says "Allt är relativt"
that is "It's all relative" But this is not what Einstein said!
The starting point for my idea of six-dimensional relativity
Dr E A B Cole mathematician who have published basic work on six dimensional realtivity.
On his homepage you find all references and an article. Among else he has written about
Prediction of dark matter using six-dimensional special relativity
Dr Matej Pavsic physicist who have published on generalised LT, three times and tachyons
He solve the causality paradox with tachyons using Everetts manyworlds interpretation of QM.
As argued in my abstract I think Everetts interpretation is doubtful.
and which to my mind shows how shaky it was when the Copenhagen interpretation was put togheter.
My view is that to belive in solipsism is intellectual hybris,
I think Platon's ideals The True. The Beautiful and The Good are a valid base for all human activities including science