(adsbygoogle = window.adsbygoogle || []).push({}); The above quote comes from motionmountain referenced in learning materials here in Physics Forums....I skimmed the relativity section (it appears quite excellent, and I'd like to dowload it, but it's about 270 pages)...anyway I am wondering about the stated limit above in GR...can some briefly explain the limit?? Special relativity limits speeds by v equal/less than c; general relativity limits force by F equal/less than c^{4}/4G.

and on page 241

What does that mean? Space and time are not distinguished globally, but only locally. Matter is required to make the distinction.

Thanks!

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# Limits in SR and GR

Can you offer guidance or do you also need help?

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