Do these make sense? Read/Listen, ask if there's a question raised in your mind, then write anything you think you need to note. But if you ask me to pause before going to the next slide, and I see you writing this down word for word, I will throw a duck at you. Don't worry, the duck will be fine. They can fly.
Characteristics of a Function from set A to set B
Each element of A must be matched with an element of B
Some elements of B may not be matched with any element of A
Two or more elements of A may be matched with the same element of B
An element of A (the domain) cannot be matched with two different elements of B