I'm reading a math book that goes from elementary math concepts to more advanced concepts taught in college. I understand that M - N should be equal to a set containing elements in M that are not in N.
In this book, there is a question which is the same as the title of this one. I don't understand the result.
Where:
M = [2; 6]
N = [4; 8[
[2;4] includes 4 in the range, which is also included in [4;8]
So M-N is including 4 which is also present in N. What am I missing?
Yes, the set difference $[2,6]\setminus [4,8)$ is $[2,4)$ -- or $[2,4[$ in French/German notation.
If you have a book that claims it is $[2,4]$, it is either a typo, or the minus in $M-N$ means something different from $M\setminus N$.