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Skimming through the literature, I find that in theoretical high-energy physics (modern gravitation theories, scalar tensor theories, etc.), older papers are more difficult to read than new papers written in the field, as I spend more time to read an older paper than a fresh one. I wonder why there is such difficulty and contrast for papers written some more than 20 years ago.

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    In Chemistry a lot of the older papers are much easier and nicer to read. They also usually describe one small topic quite well while nowadays you have to squeeze as much as you can in every paper-.- – DSVA Jul 8 '17 at 12:05
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    My experience is much more like @DSVA. Old papers in my areas in physics can be very focused and elegant. Until you get to the 50s or so, when terminology drift starts to get to you. [There's also a huge selection bias here - sufficiently unclear papers are either forgotten, or supplanted by clearer instructive reviews, etc.] – AJK Jul 9 '17 at 5:19
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I cannot comment on those specific fields, but I had a similar experience with reading old papers in my fields as well with old textbooks on undergraduate mathematics (in particular linear algebra).

The main reason I made out for this is: Didactics marches on:

  • It usually takes decades for a field to establish a useful notation and terminology. And during that time, new insights may shed new light on what once was considered a reasonable convention – and thus the process repeats. And that’s not even taking into account people sticking persistently to some notation or terminology that everybody else abandoned.

    The new terminology and notation usually prevailed for a reason, usually that it makes it more easy to communicate about your field. Also, even if you may be generally familiar with old terminology and notation, you are not as used to reading it, which slows things down.

  • Similar to the above, scientists have learnt how to write about their fields problems over the decades, allowing them to write more concisely.

  • Helpful abstractions and generalisations as well as mathematical background are often only discovered after a field has made some progress.

  • The target readership changed, knowing more about certain aspects of the required background and less about others. For example, many early works on quantum mechanics did not make use of abstract linear algebra as the audience could not be expected to be familiar with it. Nowadays, physicists are taught linear algebra in a more abstract way (due to its importance for quantum mechanics), however, they may not be so familiar with solutions of spherical partial differential equations.

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    That's not as much didactics marching on, as it is science marching on :) – darij grinberg Jul 8 '17 at 15:04
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    That said, speaking specifically about linear algebra, there are great examples of well-written older texts, such as Greub's books, whereas there are also lots of newer texts that are crap. It seems that whatever progress has been made in the last 50 years has been countered by the toxic influence of non-mathematical constraints such as "the material should fit in 1 semester" as well as misguided ideologies such as "never choose a basis" or "don't use the determinant". – darij grinberg Jul 8 '17 at 15:07
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    Typography also marches on. It also helps a little to ease reading. – Pere Jul 8 '17 at 15:50

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