# What Does a Circled X Mean in Math?

By Rachel KaploveA circled X in math can mean a few different things depending on the context. Find out what a circled X means in math with help from a professional private tutor in this free video clip.

### Transcript

Hi, I'm Rachel, and today we're going to be going over what does a circled X mean in math. A circled X is called the tensor product. So we have a circled X of A and B, that means that's a tensor product of A and B. Well what does that mean. It can get pretty complex with vectors and such but let me just show a simple example. If we have the quantity 1,2,3,4 and we're multiplying that with the circled X s it's a little bit different. You're basically multiplying everything in 1, everything in this quantity. I will show you with lets do 1, 5 and 10. Okay, so that is going to equal what we're gonna take 1 times all these numbers here for the first one so that would be 1, 2, 3, and then 4. The next one we're gonna multiply 5 by all these numbers here. So that's going to be 5,10, 15, and 20, and then for the next part we'll go down here we'll multiply 10 by all these numbers here so we get 10, 20, 30, and 40 and then we'll close the brackets like such and that's a simple example of how to use the X with a circle around it. I'm Rachel and thank you for learning with me today.