- #51

WannabeNewton

Science Advisor

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Yeah Wald uses the notation throughout his text so I've grown rather fond of the abstract index notation whilst working through the text.Re Einstein index notation, I also like Penrose's generalization to "abstract index notation". It looks a lot like the usual Einstein notation, but its meaning generalizes to infinite-dimensional spaces.

Recently, Ben Niehoff recommended to me a text on classical gauge fields (Rubakov) which I did manage to get my hands on and in it Einstein notation is used in a way that makes my blood boil In particular the author writes, for example, ##a_{i}b_{i}## instead of ##a_{i}b^{i}## when implying summation. It is quite infuriating lol.

After reading this I got the mental image that all physicists were high when doing their work xD."...the verdict of major mathematicians like J.Dieudonne is devastating [5]: “When one gets to the mathematical theories which are at the basis of quantum mechanics, one realizes that the attitude of certain physicists in the handling of these theories truly borders on the delirium. [...] One has to wonder what remains in the mind of a student who has absorbed this unbelievable accumulation

of nonsense, a real gibberish! It should be to believe that today’s physicists are only at

ease in the vagueness, the obscure and the contradictory."