- #1
Romono
- 5
- 0
Could someone please explain how the image of a set A' ⊆ A is the set: f(A') = {b | b = f(a) for some a ∈ A'}. And how can the complement of A be a subset of A? Forgive my ignorance here, I'm a beginning student of set theory.
Edit: Maybe I should rephrase my question: Could you explain what "the image of a set A' ⊆ A is the set: f(A') = {b | b = f(a) for some a ∈ A'}" actually means? Could you break it down? I don't understand what an image of a set is even after reading the definition here.
Edit: Maybe I should rephrase my question: Could you explain what "the image of a set A' ⊆ A is the set: f(A') = {b | b = f(a) for some a ∈ A'}" actually means? Could you break it down? I don't understand what an image of a set is even after reading the definition here.
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