Top network posts

• 30 Can two topological spaces surject onto each other but not be homeomorphic?
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• 18 $f: \mathbb{R} \to \mathbb{R}$ that takes each value in $\mathbb{R}$ twice
• 18 Do differentiable functions preserve measure zero sets? Measurable sets?
• 18 Good examples of Lagrange multiplier problems
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