Theory of Programming Languages/Help

This is the help page for Theory of Programming Languages. Please feel free to post whatever questions you may have here. Asking questions is an integral part of the learning process so do not hesitate to post here, even if you feel it is tangential.

It is recommended that each new topic should be in its own section. A new topic may be started with a pair of double equal-sign characters like so:

 
== This is the title of my topic ==
My question goes here.

Please start new topics below this line.