On Sunday, January 20, 2019 at 2:56:19 PM UTC-6, John Clark wrote:
>
> On Sun, Jan 20, 2019 at 2:03 PM Philip Thrift <cloud...@gmail.com 
> <javascript:>> wrote:
>
> >> Experiments involve space and time, if those equations involve neither 
>>> I don't see how you could ever test them to see if they're correct;  and if 
>>> you can't do that then it's not science, it's just philosophy. And 
>>> philosophers have been proven wrong far more often than proven right.
>>>
>>  
>> *> What we call space (x,y,z) is just what we measure with a ruler.*
>> *What we call time t is just what we measure with a clock.*
>>
>
> True, and thus space and time have well defined definitions. And that's 
> why we can't do experiments without a ruler and a clock, you wouldn't know 
> where to look for the results or when to look. Without experiment or 
> prediction or even postdiction you're just navel gazing not doing physics.
>
> John K Clark
>
>
>>
I don't understand space and time have well defined definitions. If (say) 
LQG is right, then all there are are quantum particles and spinfoam cells 
(QPs+SCs=QPSCs) - that's all the stuff there is (spacetime itself is now 
stuff to), then all rulers and clocks are are things made of QPSCs.

- pt

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