If a and b are two sets then prove that a-b=a if and only if a intersection b= fi
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A - B means everything in A except for anything in 
Let X is an arbitrary element of A - B
it means , 
 and 
 and 


similarly, Let y is an arbitrary element of 
then, 
 and 
 and 


Let X is an arbitrary element of A - B
it means , 
 and 
 and 


similarly, Let y is an arbitrary element of 
then, 
 and 
 and 


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