On 5 mar, 04:11, Tom Roberts <tjroberts...@sbcglobal.net> wrote:
> Albertito wrote:
>> In 1893 Ernst Mach stated the so-called Mach Principle:
>>   "For me only relative motion exists. When a body rotates
>>    relative to the fixed stars centrifugal forces are produced.
>>    When it rotates relatively to some differ­ent body but not
>>    relative to the fixed stars, no centrifugal forces are produced.
>>    I have no objection to calling the first "rota­tion" as long as it
>>    be remembered that nothing is meant except relative rotation
>>    with respect to the fixed stars."
> 
> That is merely one of many statements like this made by Mach over
> several decades. There is no definitive version of "Mach's Principle",
> but there are numerous rather similar statements that differ in details.
> 
>> SR does not incorporate Mach Principle, and that's a serious flaw!
> 
> Yes, SR does not include Mach's principle. But this is not a flaw -- SR
> was never intended to include such things. SR is a model of an EMPTY
> universe, or a model of the LOCAL behavior of any other universe.
> 

I see, SR is a model of an EMPTY universe, that's the reason why SR
is so EMPTY of sense, it can describe an EMPTY universe.