It is that of increasing knowledge of empirical fact intimately combined with changing interpretations of this body of fact – hence changing general statements about it – and not least a changing a structure of the theoretical system.
It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory resulting in a very great theoretical development are completely trivial from any point of view except their relevance to the structure of a theoretical system.
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The hypothesis may be put forward to be tested by the s subsequent investigation that this development has been in large part a matter of the reciprocal interaction of new factual insights and knowledge on the one hand with changes in the theoretical system on the other.
