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• 68 Not every metric is induced from a norm
• 30 Understanding the definition of Cauchy sequence
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• 27 Real numbers equipped with the metric $ d (x,y) = | \arctan(x) - \arctan(y)| $ is an incomplete metric space
• 25 How to find all the maximal ideals of $\mathbb Z_n?$
• 21 Describe all ring homomorphisms
• 16 $\mathbb{Q}$ is not open, is not closed, but is the countable union of closed sets.
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