User Tristan Batchler - Mathematics Meta Stack Exchange

Tristan Batchler

Member for 8 years, 2 months
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Aug 31, 2020

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13

The Order of the Identity of a Group

7

$a/b < (1 + \sqrt{5})/2 \iff a^2 - ab - b^2 < 0$?

7

Why the order of elements of my group $\mathbb{Z}\left[\sqrt 7\right]$ under multiplication modulo prime $p$ often divide $p^2-1$

6

If the sum of eigenvectors is an eigenvector, then they all correspond to the same eigenvalue

5

Showing that $\sum\limits_{r=0}^n({1 \over r!} \sum\limits_{s=0}^{n-r}{(-1)^s \over s!}) = 1$