Okay, kiddo, let me explain what j-multiplicity means. Do you know what numbers are? They are like how many of something you have. Like if you have one toy, that toy has a number and the number is one.
Now, imagine you have a bunch of toys that are all the same, but they're different colors. Let's say you have red, blue, and green toys. The j-multiplicity tells you how many different colors of toys you have.
It's like counting how many different types of things you have, even if they all look similar. So, if you have three colors of toys, then the j-multiplicity is three.
Do you understand, sweetie?