[tex-k] A210: nonfinal item should end in a semicolon, not period

胡亚捷 (Hu Yajie) 2500418497 at qq.com
Tue May 25 12:29:57 CEST 2021

The TeXbook, page 210, exercise 20.13 says:

which of the following are true?
(a) `\if\a\b'; (b) `\ifcat\a\b'; (c) `\ifx\a\b'; (d) `\if\c'; (e) `\ifcat\c';
(f) `\ifx\ifx\ifx'. (g) `\if\ifx\a\b\c\else\if\a\b\c\fi\fi'.

Why does the next-to-last item end in a period? In 2013 I'd think Knuth must
have a reason because he was infallible (a common myth among programmers),
but now I suspect this is an editorial oversight.


By the way, the recent TUGboat article "Lapses in TeX" did't mention that
TeX produces bad spacing when typesetting "{\sl The value of $l$ has ...}"
but I don't know what the proper spacing should be. No italic correction
after the $l$? Or there should be an italic correction after "of"?

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