Mathematics
Michael Hartley's user avatar
Michael Hartley's user avatar
Michael Hartley's user avatar
Michael Hartley
  • Member for 9 years, 6 months
  • Last seen this week
Profile Activity
Stats
2,283
reputation
22k
reached
98
answers
3
questions
Communities
Badges
View all badges
This user doesn’t have any gold badges yet.
9
silver badges
6
bronze badges
Top tags
View all tags
20
Score
7
Posts
7
Posts %
14
Score
10
Posts
10
Posts %
13
Score
8
Posts
8
Posts %
11
Score
5
Posts
5
Posts %
9
Score
8
Posts
8
Posts %
8
Score
8
Posts
8
Posts %
Top posts
View all questions and answers
All Questions Answers
Score Newest
answer
8
If $a$ is a root of $x^2+ x + 1$, simplify $1 + a + a^2 +\dots+ a^{2017}.$
Aug 28, 2017
answer
6
Fibonacci 19^n is multiple of 19 a mathematical property or a unique event?
Nov 24, 2022
answer
4
Showing that either $v$ is an eigenvector for $2\times 2$ matrix $A$ or else $(A − \lambda \operatorname{Id})v$ is an eigenvector for $A$.
Feb 5, 2019
answer
4
If I flip two fair coins, and then tell you that one is heads, what is the probability that the other coin is also heads?
Feb 5, 2019
answer
4
A Number Theoretic Game
Jun 23, 2021
answer
4
Let $V$ be the space spanned by $v_1=\cos^2x$, $v_2=\sin^2x$ and $v_3=\cos2x$.
Aug 28, 2017
answer
4
Proving the sum to product formula with complex numbers starting from the left hand side
Aug 30, 2021
answer
4
If $450^\circ<\alpha<540^\circ$ and $\cot\alpha=-\frac{7}{24},$ calculate $\cos\frac{\alpha}{2}$. Why is my solution wrong?
Aug 14, 2017
answer
4
The sequence $(x_n)$ : $x_{n+2}=\frac{x_{n+1}\sqrt{x_n^2+1}+x_{n}\sqrt{x_{n+1}^2+1}-x_n-x_{n+1}}{x_{n+1}x_n-(\sqrt{x_{n+1}^2+1}-1)(\sqrt{x_n^2+1}-1)}$
Aug 30, 2021
answer
4
Write all permutations in the cyclic group $C_{12}$ ​of order 12 in cycle notation.
Nov 16, 2021

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.