I want to understand low-level stuff like \if better. I'm not looking for some random examples off Google showing me some statements but a specification of some sort - something mean and unforgiving. ...
I want to define a key, which, if set, sets a boolean variable to false. The documentation is not clear on that point. It states (source3.pdf, sect. 87, p. 134): Defines <key> to set ...
In the documentation for the ifthen package, there is a test called \lengthtest which compares two <dimen> parameters with the operators <, > or =. (For other test commands, <dimen> ...