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I vividly remember once reading (or hearing?) a claim that the level of a mathematical text is inversely proportional to the $$ \boxed{\text{density of boxed formulas}}. $$ Now I can’t find/remember where nor even in which language it was. Would MO’s collective memory come to the rescue?

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    $\begingroup$ Last week, I happened to be looking at Spivak, the book on AmS-TeX, and the quote was in there (in English). Unfortunately, I misplaced it, so I can't give the explicit reference. But I don't think he used the word density, rather the number of, and didn't box it either. $\endgroup$ Commented Aug 27 at 22:04
  • $\begingroup$ @DavidHandelman That's it, perfect, thank you!! $\endgroup$ Commented Aug 27 at 23:36

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From Spivak, The Joy of Tex does not use the word density

enter image description here

$$ \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc $$

$$ \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc $$

Next, scanned from a library copy at Sedgley Park College, Prestwich, Manchester,

enter image description here

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    $\begingroup$ Thanks!! (I tried to comment earlier but somehow it wouldn’t go through.) $\endgroup$ Commented Aug 28 at 1:39
  • $\begingroup$ @FrancoisZiegler you're welcome. There is a related quote in a different(?) book, in which the author says not to overuse boxes, that he has not used any boxes in his book. I can't seem to find that one $\endgroup$ Commented Aug 28 at 2:58
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    $\begingroup$ True to his word, Spivak does use boxed statements in his Calculus book, but not in Calculus on Manifolds. However, there are some boxed formulas in his differential geometry volumes. $\endgroup$ Commented Aug 28 at 17:09
  • $\begingroup$ @MatthewLeingang you are wise. I put in a page from Calculus that has boxes $\endgroup$ Commented Aug 28 at 19:41
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    $\begingroup$ @MatthewLeingang Presumably by the time a student has finished Spivak's Calculus, they have learned to *think outside the box" ... $\endgroup$ Commented Aug 29 at 1:26

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