4
votes
1answer
737 views

Define abstract environment in book

I want to define an abstract environment for \documentclass{book}. Therefore, I copied the relevant definitions from report.cls from here into my preamble. But it doesn't work. Where's the problem? ...
10
votes
2answers
823 views

Placing items before \documentclass

When looking in books or at sample code, I always see \documentclass appearing first. Is that absolutely necessary? I have created some test code which seems to compile fine: \def\SetClass{article} ...