Relativity Is Synge's Special Relativity Still Relevant Today?

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Synge's Special Relativity, while historically significant, is viewed as somewhat outdated due to its 1955 conventions, such as the use of ##x_4 = ict##. Many participants in the discussion express a preference for more modern texts, like Synge's 1960 General Relativity book or works by Pauli, Papapetrou, and Eddington. Despite its dated aspects, some argue that Synge's text provides unique spacetime-geometric insights that may not be found in contemporary literature. Overall, it is considered more suitable as a reference rather than a primary or secondary textbook for current studies.
Frabjous
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I stumbled across a cheap copy of Synge’s Special Relativity. I know that it was an important book, but there is an undercurrent in the comments that it is now dated. Is it still worth spending time with?
 
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For me, just because it was written in 1955 using ##x_4 = ict## is major reason to dismiss it. I would rather have his 1960 GR book (using a flat +++- metric) as a textbook, a more modern Pauli, Papapetrou or Eddington.
 
In my opinion, Synge's text offers some possibly useful spacetime-geometric insights not found elsewhere. So, in spite of its dated conventions and notations, it still could be useful as an interesting reference... but not as a primary or secondary textbook.
 
Thanks.
 
By looking around, it seems like Dr. Hassani's books are great for studying "mathematical methods for the physicist/engineer." One is for the beginner physicist [Mathematical Methods: For Students of Physics and Related Fields] and the other is [Mathematical Physics: A Modern Introduction to Its Foundations] for the advanced undergraduate / grad student. I'm a sophomore undergrad and I have taken up the standard calculus sequence (~3sems) and ODEs. I want to self study ahead in mathematics...

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