13 questions linked to/from How to best debug LaTeX?
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### How do magic \dots work in amsmath?

The amsmath package redefines the \dots command so that it "guesses" the correct height of the dots with respect to its context. For example $x, \dots, y$ will produce three lowered dots, aligned ...
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### Reading the contents of a box

Is it possible to take a box and retrieve the following information from it: A list of all "top level" internal boxes; All intervening space (kerns and glue: did I forget another type of space?)? ...
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### Latex \tracing commands list?

Often I need to recall the different \tracing commands; and a couple of times I stumbled on some webpages that worked fine for me; sadly, I didn't keep them, and my searches don't take me there ...
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### Why can't TeX show us the actual “undefined control sequence”?

This is a question on the internals of the TeX system rather than on how to use it. Every time an undefined control sequence is used in a document, TeX prints the message undefined control sequence [...
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### Visualize bibliography entry process of biblatex

I'm currently working on modifying the verbose biblatex style to my needs. In order to find out what's going on and to find the definitions I need to modify, I've been digging through a number of ...
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### Why doesn't Tex have a proper debugger? [duplicate]

Why doesn't TeX have a debugger? And by 'debugger' I mean a dedicated application in which you can set breakpoints and watch the values of registers, macros, etc. as they change in real time, maybe ...
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### Is there a list of common misleading errors and how to go about debugging the real problem

Yesterday I posted a question "My attempt to local redefine a command is failing and not sure why" which I really knew the answer to. But I was thrown by the error message I was getting and after ...