What is the correct name for those mathematical operations?

Question

I am not an english speaker, however I need to write code where I need to include print messages in English, hence using english terminology from Math, statistics etc.

This is the case: I have two lists and I compare them, let's say: list 1 - 1 2 3 4 5 list 2 - 2 4 6

So naturally when I compare both lists you see that 2 4 are present in both lists. What is the operation itself called? Because when I try to translate it from my language to english it's "section" or "cutting". I don't believe that this is the official mathematical term for this operation.

Also I want to know what is it called when you show the things that are missing in both lists. For example 1 3 5 6 ?

Thanks and sorry for the silly question.

Answer 1

Intersection for {1,2,3,4,5} ; {2,4,6} = {2,4}
Symmetric difference for {1,2,3,4,5} ; {2,4,6} = {1,3,5,6}