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[Moderator's note: This thread was spun off from a previous thread in the Quantum Physics forum. It was moved here since this specific subject is more on topic in this forum.]
I didn't say that somebody who uses the relativistic mass doesn't understand relativity. It's just an unneeded complication in presenting the theory, particularly there's no way to define it properly in GR. You know what I think about Purcell's didactics. Of course Feynman's didactics is brillant (the 2nd-best textbook writer I know of), but even a brillant mind can err!
I didn't say that somebody who uses the relativistic mass doesn't understand relativity. It's just an unneeded complication in presenting the theory, particularly there's no way to define it properly in GR. You know what I think about Purcell's didactics. Of course Feynman's didactics is brillant (the 2nd-best textbook writer I know of), but even a brillant mind can err!
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