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David R.'s user avatar
David R.'s user avatar
David R.'s user avatar
David R.
  • Member for 9 years, 11 months
  • Last seen more than 4 years ago
32 votes
5 answers
17k views

What is the proper way to extend the Fibonacci numbers to negative numbers?

15 votes
11 answers
1k views

What are better approximations to $\pi$ as algebraic though irrational number?

12 votes
3 answers
776 views

What are the integers of $\textbf Q(\sqrt 2 + i)$?

12 votes
4 answers
2k views

How to tell two ideals belong to the same ideal class group

12 votes
3 answers
511 views

Why do so many computer programming language implementations have trouble with the remainders of negative integers?

10 votes
3 answers
388 views

Does this function change signs infinitely often?

9 votes
1 answer
205 views

For which norm-Euclidean domains is the proof interval less than $1$?

9 votes
1 answer
240 views

How else can I tell I can do this with $5$ but not $2$ or $3$ in $\textbf{Z}[\sqrt{30}]$?

9 votes
4 answers
1k views

How to get polynomial of algebraic number that is not algebraic integer

8 votes
2 answers
247 views

How to improve this bound?

7 votes
3 answers
4k views

What is the norm of a number in a cubic integer ring?

5 votes
3 answers
173 views

How to determine how many elements in $R / I$ where $R$ is ring of quadratic integers

4 votes
1 answer
89 views

Is there a formula to calculate base digit swaps given two specific bases?

3 votes
1 answer
166 views

$\langle 7, 3 + \sqrt{-5} \rangle = \langle 7, 4 + \sqrt{-5} \rangle$, right?

3 votes
2 answers
227 views

What is the trace of an integer of algebraic degree $1$?

3 votes
0 answers
183 views

Is it possible for an integer ring of algebraic degree $4$ to have no intermediate rings?

2 votes
0 answers
40 views

When the algebraic degree of the ring containing the GCD is not obvious

1 vote
1 answer
172 views

Are there online Euclidean GCD calculators for Euclidean domains other than $\textbf Z$?

1 vote
2 answers
652 views

Is $\mathbb{Z}[\sqrt{2} + \sqrt{3}]$ closed under multiplication?