Are frames in physics necessary?

[bcrowell]

I agree with you that there's no way to measure anything without the careful reference to a reference frame. Only the last sentence contradicts this obvious fact again. It must be "You can NOT have, e.g., clocks without having a frame of reference." Otherwise, please describe a clock which does not define a reference frame. I cannot even imagine something like this. Note that I talk about a real thing not a coordinate in the mathematical world!

You've discussed this extensively in various threads on the site, and I disagree. I don't think there is much to add to that discussion.

 

[vanhees71]

No, this is utmost important. I'd like to understand how you define a clock without a frame!