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user7090

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earned this badge 3 times.

Example of two open balls such that the one with the smaller radius contains the one with the larger radius.

Awarded Jun 28, 2019 at 17:10

Prove that the family of open sets in $\mathbb{R}$ has cardinality equal to $2^{\aleph_0}$

Awarded Mar 22, 2016 at 18:29

For every rational number, does there exist a sequence of irrationals which converges to it?

Awarded Nov 3, 2014 at 23:00

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