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Mathematics
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JohnT
  • Member for 2 years, 7 months
  • Last seen more than a month ago
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9
Proving $|1 + z_1|^2 + |1 + z_2|^2 + \ldots + |1 + z_n|^2 = 2n$
Jan 14, 2022
5
Every real number has at most two decimal expansions
Nov 26, 2021
5
Verifying $\{0,1, \ldots, n-1\}$ is a group
Apr 12, 2022
5
In a group, when does $|ab| = \mathrm{lcm}(|a|, |b|)$
Apr 4, 2022
4
Each symmetry of a triangle corresponds to exactly one permutation
Apr 27
4
Proving that $\text{SL}_2 (\mathbb{Z})$ is closed under inverses
Mar 14
4
Symmetry group of the unit circle in $\mathbb{R}^2$ versus $\mathbb{R}/\mathbb{Z}$.
Mar 13
4
Proof organization: proving the set of functions $f: \mathbb{R} \to \mathbb{R}$ is a direct sum of even and odd functions
Apr 3, 2022
4
Question on openness in the topology generated by a basis
Jan 26, 2022
3
Artin's definition of "coordinate vector"
Feb 19, 2022