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Tristan Batchler

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The Order of the Identity of a Group

group-theory soft-question asked May 19, 2017 at 5:49

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

linear-algebra proof-verification proof-writing eigenvalues-eigenvectors asked Apr 28, 2017 at 23:43

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

sequences-and-series algebra-precalculus proof-writing fibonacci-numbers golden-ratio asked May 14, 2017 at 14:37

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

group-theory number-theory asked Mar 23, 2021 at 5:49

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

sequences-and-series algebra-precalculus summation asked Aug 14, 2016 at 6:51

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The $n$th derivative of $\frac{1}{5x^5 + 1}$ at $x=0$ is $0$ for all $n$ which is not a multiple of $5$?

real-analysis proof-writing taylor-expansion asked May 30, 2017 at 23:51

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