Dear students,
Under the day 6 of the lectures, I have uploaded the slides of the material we went through in the lecture, regarding the formal 
definition of limit towards in infinity
You can find the examples we went through, and at the end of the slides, I have added a short list of exercises so you can practice. Dario will go through some of those during his session on Monday.
Notice that this material is neither included in the old videos, nor can be found in the book. But mind you, although it may appear in the exam, it would only count towards obtaining A grades.
If I found some video resources that can be useful for you, I will link them in the course-page.
Best,
Salvador