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Mathematical Analysis Fundamentals by Agamirza Bashirov

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image

is a relation of equality in Ximage. If (a,b)Rimage, then we prefer to write a=bimage. Another example is

R=(a,A)X×2X:aA,

image

which defines a membership relation between elements and subsets of X. For (a,A)R, we write aA. One more example is

R=(A,B)2X×2X:A

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