Mathematics · Real Analysis
If A = { 1p + 1q : p, q ∈ &mathbb{N}; }, then its derived set A' (the set of all limit points) is:
- 1{0} ∪ { 1p : p ∈ &mathbb{N}; }✓
- 2{0}
- 3A ∪ {0}
- 4A
Correct answer
{0} ∪ { 1p : p ∈ &mathbb{N}; }
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