Fortunately, I majored in mathematics! ! Since you can't read that kind of writing! ! Let me talk about it in a popular way! ! Do you have any questions to add?

602 144055, let's discuss and study together! ! Learning is a progressive process! Ha ha! !

Now that we have determined a function and have a set, we substitute the values in this set into this function one by one, and the result is not zero, then this set is called a branch of this function! ! Literally, it means to support the collection of this function, so that it is not 0! ! !

I hope it helps you! ! I wish you success in your studies! ! Happy every day! !