Complement (Set Theory)

FTR  Concept of a 'complement':

If Influenza A virus subtype H5N1 is the surface area colored cherry-red inwards this image... ... together with then the complement of Influenza A virus subtype H5N1 is everything else. 

 In develop theory, the complement of a develop Influenza A virus subtype H5N1 refers to elements non inwards A. 

When all sets nether consideration are considered to hold upwards subsets of a given develop U, the absolute complement of Influenza A virus subtype H5N1 is the develop of elements inwards U only non inwards A. 

The relative complement of Influenza A virus subtype H5N1 amongst abide by to a develop B, likewise termed the deviation of sets Influenza A virus subtype H5N1 together with B, written B ∖ A, is the develop of elements inwards B only non inwards A.

If A is the surface area colored cherry-red inwards this image...

... together with then the complement of A is everything else.

Now via an Art methodology: