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

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Homework Statement


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 .


Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #2
micromass
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Yes, you are probably right. The notation [itex]\overline{N}[/itex] just means all the elements which are not in N.
 

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