Recent content by Adam35

Hi all, thank you very much, especially to Samy_A for a very quick answer. Now it is completely clear to me. To Orodruin: I did this manipulation exactly because I thought that I can. The result was 1=4 as Ibix said which sound weird to me and I was not able to tell what was wrong. Now I know...

Hello, since gμν gμν = 4 where g = diag[1,-1,-1,-1], see: https://www.physicsforums.com/threads/questions-about-tensors-in-gr.39158/ Is the following equation correct? xμ xμ = gμνxν gμνxν = gμν gμνxν xν= 4 xμ xμ If not, where is the problem? Cheers, Adam