What is this equation called?

[Goethe10]

Hello everybody.
I'm foreigner and I'm studying mathematics.
I would like to find online resources to help me understand/solve my problem, however due to fact that I'm studying math in my own language, rather than English. I have a bit of a trouble.
Here is the problem I'm trying to solve

Thank you

 

[Ray Vickson]

Hello everybody.
I'm foreigner and I'm studying mathematics.
I would like to find online resources to help me understand/solve my problem, however due to fact that I'm studying math in my own language, rather than English. I have a bit of a trouble.
Here is the problem I'm trying to solve

Thank you

You do not have an 'equation' (which would need an '=' sign somewhere in it); you just have a problem in set theory. Your problem is easily solved just by figuring out what is $B \cup C$ and what is meant by "\". Those are notations from set theory, and can be found in many books or in many on-line sources. Google is your friend.

 

[MrTheBard]

Goethe,

Ray Vickson is right. What you have supplied us with is not an equation.

 

[tiny-tim]

Hello Goethe10!

Google "union and intersection".