# Subsets and sets symbol explenation (Very simple question please have a look)

1. Aug 27, 2012

### astrozilla

1. The problem statement, all variables and given/known data
Hi
I would like you please to look my attachement ,and explain to me the meaning of the line above M and N whats the meaning of this line?It seems to me that it acts as we should take the complementary collection of numbers .

2. Relevant equations

3. The attempt at a solution

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2. Aug 27, 2012

### micromass

Staff Emeritus
Yes, you are probably right. The notation $\overline{N}$ just means all the elements which are not in N.