Exercises
[250]Let \(D,C\) be non-empty sets and \(f:D\to C\) a function. Given \(U\subseteq C\) show that
\[ f(f^{-1}(U)) \subseteq U~ ; \]if \(f\) is surjective show that they are equal; find an example where they are different.
EDB β 250
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Authors:
"Mennucci , Andrea C. G."
.
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