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What is the difference between \let and \def?

Contest: Show Off Your Skillz in TeX & Friends [TeX.sx birthday]

What is the most bizarre thing you have seen done with TeX

PDF colour model and LaTeX

What is the difference between \let and \edef?

What are the incompatibilities of pdftex, xetex and luatex?

making low-quality PDF files clearer

Why is there a \, space at the beginning of the “aligned” environment?

Viewer-independent copyable spaces at the beginning of a line?

The \lowercase trick

Obtain \badness or glue adjustment for each line

Exercise 17.21 of Knuth’s TeXbook: a (known) error?

What exactly is a “single character” or “symbol” in math mode?

Check all hyphenations within a document

Is there a way to get at the value of \prevdepth from the main vertical list inside the output routine?

Why are \new… defined as \outer in the plain TeX format?

How to create a virtual font?

Can I see a plain TeX source file please?

Reviewing hyphenations with LuaTeX

Is there an “Appending \let”?

Using end-of-line delimiter in plain Tex macro

How does plain TeX \insert work?

Metafont Book - problems with gray.tfm and displaying “experiment 2”

ConTeXt: PDF Colour Space

Minimum length of last line of a paragraph

Include PDF via \pdfliteral

Plain TeX macros contains \par as parameter delimiter, but doesn't work with \obeylines, why?

Fixing fonts with LuaTeX feature files

Missing baselineskips?

How can I check whether two control sequences have the same name?