Questions about Einstein SR interpretation

[ghwellsjr]

I would definitely consider it testable! If for you an "assumption" can be tested then I have no problem with your use of the word. But ghwellsjr seemed to have been using the words "assumption" and "postulate" differently in post #35, to mean something that is true as a matter of the definitions used, and is not testable:

This is what the disagreement between myself and ghwellsjr here was about.

Please followup on any more discussion with me on this new thread:

https://www.physicsforums.com/showthread.php?p=2938903#post2938903