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Martin Sleziak
Martin Sleziak
12:38 PM
36
A: What is the differences between mathcode and catcode and how can I use mathcode?

David CarlisleIn text a character token just has two properties, its character code and its cat(egory)code. If + is seen in the file it is (normally) given catcode 12 (punctuation) and character code comes from the file encoding so is 43 in this case. In math mode lists the math atoms need more structure, Eac...

> \delcode is similar but packs in a few extra bits as delimiters need more information the delcode of ( in plain is
> \delcode`(="028300
> which says that small ( come from position hex 28 in font \fam0 but then you need to switch to character hex 0 in \fam3 to get big brackets. (The font metrics specify chains of glyphs to use to build larger characters if needed, but they need to know where to start.
 

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