1. Math
  2. Algebra
  3. 3 let f ab be a function and let x...

Question: 3 let f ab be a function and let x...

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3. Let f: AB be a function, and let X and Y be subsets of B. Note that the inverse image of X, denoted by f(X), is defined by f-i(X)-(a E Alf(a) e X). Prove that f-1(X U Y) = f-1(X) u f-1 (Y).
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