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Homework Statement:

Assume that f:A—>B and that R is an equivalence relation on B
Define Q to be the set {<x,y> ∈ A X A <f(x),f(y)> ∈ R}
Relevant Equations:
 Define Q to be the set {<x,y> ∈ A X A <f(x),f(y)> ∈ R}
I can’t understand it.