R' is an observer from I'. A rod is in a state of rest relative to him. He measures its proper length L(0). An observer R from I measures its Lorentz contracted length L related by(adsbygoogle = window.adsbygoogle || []).push({});

L=L(0)sqrt(1-vv/cc) (1). If we reverse the situation, R measuring the proper length of the rod R' measuring its Lorentz contracted length. Please tell me what is the name of the property that makes that (1) holds in that case as well.

Thanks

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# Length contraction from two inertial frames

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