Bottom margin vs. descenders question

Doug McKenna doug at
Sun Jul 5 18:52:57 CEST 2020

All - 

It's been quite a good and illuminating (so to speak) discussion about this subject since I asked. 

I have concluded with if all one has is a PDF and a nominal rule that there should be a 1" bottom margin on the page with no page numbers, it's not possible to report a margin breach robustly without false positives, due to descenders generally being allowed to go below the margin's bounds, which makes optical sense. It works for unwanted page numbers, though, which is worth complaining about in a paper submission. The proceedings editors will still have to do some visual culling of occasional false positives. 

Enclosed is a screenshot of what I have tried to output in my program. The red lines have been superimposed onto the PDF to show where the margin bounds are. This seems a perfect example of what has just been discussed: a math formula with large delimiters on the bottom line of the page that descend quite a bit into the margin area in order to maintain the baseline of the bottom line on every page at the same vertical position. It is typeset properly, even though it breaches the margin. I believe this was typeset with TeX/LaTeX. 

Doug McKenna 

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