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{tex-core} is for questions for syntax, semantics and expected behavior of TeX primitive control sequences, regardless of extensions (eTeX, etc.) formats (Plain or LaTeX) and macro packages (tikz). Such questions usually relate to low-level TeX programming or the behaviour of TeX at an underlying level. Note that even Plain TeX is a format in itself; for questions about it, use {plain-tex}.

is for questions for syntax, semantics and expected behavior of TeX primitive control sequences, regardless of extensions (eTeX, etc.) formats (Plain or LaTeX) and macro packages (tikz). 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 (built-in commands), the basics of macro programming, TeX's expansion mechanism and so on. 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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