Here you can discuss books, poetry, short stories, plays, etc., either for your reading pleasure or books that you have to read for A1 class. This forum is for the discussion of books only, whereas discussion of any literature assignments should go in the Language A1 forum.
Check out this blog post for a bunch of ideas: https://www.blog-posts.lanternaeducation.com/ib-blog/50-ib-maths-ia-topic-ideas/
Another way to find an idea is to take a look through a math textbook that isn't an IB one, but is at a similar level, and see if there are any topics that you find interesting! I found my math IA idea by looking through an AP Calculus textbook and looking at the "exploration" boxes where they talk about interesting concepts that aren't strictly on the syllabus! Hope this helps