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May
24
comment Understanding ext@arrows
Try to read my initial post first.
May
24
comment Understanding ext@arrows
Thanks. This is exactly what I found (and tried to describe in my initial post). I was confused about the useless calculations. Firstly, there is no need to have #3 and #4 as separate arguments. Secondly, instead of \hbox{$\scriptstyle\mkern#3mu{#6}\mkern#4mu$} one could simply add #3 and #4 (because #3 and #4 are only needed when #6 and #7 [the texts] are empty). I simply was not expecting such an cumbersome macro in a high-quality package like amsmath and had doubts about my reasoning.
May
24
comment Understanding ext@arrows
I doubt that (as I wrote above). #3 and #4 are only used for the width measurement, not for typesetting. A test confirms that. $\ext@arrow 00{40}0\rightarrowfill@{a}{b}$ produces centered text.
May
24
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May
24
revised Understanding ext@arrows
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May
24
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May
24
asked Understanding ext@arrows