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Mathematics
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JohnT
  • Member for 2 years, 8 months
  • Last seen more than 2 years ago
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10
Proving $|1 + z_1|^2 + |1 + z_2|^2 + \ldots + |1 + z_n|^2 = 2n$
5
Every real number has at most two decimal expansions
5
In a group, when does $|ab| = \mathrm{lcm}(|a|, |b|)$
5
Verifying $\{0,1, \ldots, n-1\}$ is a group
5
Proving that $\text{SL}_2 (\mathbb{Z})$ is closed under inverses