is for questions that are independent of formats and macro packages. Such questions usually relate to low-level TeX programming or the behaviour of TeX at an underlying level.

Questions tagged will in general cover topics such as TeX primitives (build-in commands), the basics of macro programming, TeX's expansion mechanism and so so. Good reference works for these low-level TeX concepts include The TeXbook and TeX by Topic (the later is freely available).

Note that even Plain TeX is a format in itself; for questions about it specifically, use .

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