Mat-1.1020 L2 course is a course usually taken by theoretical-physicist-dept students in Aalto University, here official site. It is a mass course that a massive amount of students fail every year. It was much worse earlier when the books were not open but luckily the lecturer opened up the books for public review, here (for some reason, I cannot find the first book anymore -- sign) and here.
Please, provide here material generated by users and only include questions with references so easier for future students to self-study!
Course book (Finnish): ISBN-952-91-9159-6 (2007), pages 515-1052.
Source of the comic here.