Is it fair to assume that if an
\include command does not add a blank page both before and after, it is because the chapter starts on a page with an odd page number ?
I thought I was having trouble with
\include. I had the impression from for example
\include would add a page both before and after. I had one
\include statement in my document and there was indeed a blank page both before and after the chapter. When I added more
\include statements I didn't see the same behavior and thought something was wrong until I noticed chapters start on odd page numbers which lead to my assumption above.