Say that I have an article with multiple pages. Each page has a short title for in the URL (wordpress calls them post slugs). If this title is not given in the URL, the first page is shown, so example.com/myarticle is the same page as example.com/myarticle/firstpage.
The question is: Should I redirect the former to the latter? And if so, which code? 301, 303?
Keep in mind that the title of the first page may be changed (or they may even be a new first page) after the article was published. example.com/myarticle might point to example.com/myarticle/introduction now, but in the future it could be example.com/myarticle/tableofcontents, if the author decides to shuffle around his article.