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author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /usergrps/uktug/baskervi/5_2/carlisle.tex |
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diff --git a/usergrps/uktug/baskervi/5_2/carlisle.tex b/usergrps/uktug/baskervi/5_2/carlisle.tex new file mode 100644 index 0000000000..4b827a25e0 --- /dev/null +++ b/usergrps/uktug/baskervi/5_2/carlisle.tex @@ -0,0 +1,26 @@ +\title{Letters to the editor 2: Maths in \protect\LaTeX, Part 3} +\author{David Carlisle} +\begin{Article} + + The comments on the inadvisability of redefining user level commands + are valid, but the example in question, \verb|\emptyset| in the AMS + packages, is just due to an error in the first printing of \emph{The + \LaTeX\ Companion} (as noted in \texttt{compan.err} in the \LaTeX\ + distribution.) The `amssymb' package does not redefine + \verb|\emptyset|. It still looks like a 0 with a line through it. The + same glyph as in plain \TeX. \verb|\varnothing| is a slashed-circle. + +Actually this raises an interesting side issue. The error in the +Companion printing was due to an error in the styles for \emph{Lucida} +fonts. (The Companion does not use the cm or AMS fonts). As Lucida +does provide both glyphs, it was simply an error to have the names +interchanged, but consider a hypothetical situation of a math font +family that only provides one slashed-closed-curve. How visually +dis-similar to $\emptyset$ may it be before it becomes unacceptable to +assign it to the command \verb|\emptyset|? For text fonts large differences +are acceptable. `Q' does not look much like `\texttt{Q}' but both are +accessed by `Q' and any differences are accepted by the reader as +differences in font design. In mathematics the situation is not at all +clear\ldots + +\end{Article}
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