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badjohn
  • Member for 7 years, 11 months
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  • Warwickshire, United Kingdom
9 votes
1 answer
980 views

Nilpotent with infinite degree?

9 votes
2 answers
988 views

4-adic numbers and zero divisors

7 votes
0 answers
219 views

Fibonacci sequence in $\mathbb{Z}_5$

7 votes
1 answer
2k views

Automorphisms of matrix rings

5 votes
3 answers
1k views

Square roots in rings

5 votes
3 answers
192 views

Does $\frac{(x^2 + y^2) y}{x}$ have a limit at $(0,0)$?

5 votes
2 answers
442 views

Non-commutative finite division rings (or rather not)

5 votes
2 answers
116 views

Solving $f''(t) = g(f(t))$

4 votes
1 answer
311 views

Bourbaki and zero

3 votes
1 answer
217 views

Maths on the Paris Metro

3 votes
0 answers
76 views

Cutting an arbitrary object into equal sized pieces

3 votes
0 answers
43 views

Derivatives of real functions which preserve the rationals [duplicate]

2 votes
0 answers
290 views

Automorphisms of matrix rings - part 2

2 votes
2 answers
92 views

Analogue of normality for continued fractions

1 vote
0 answers
33 views

Periodic functions of arbitrary groups

1 vote
1 answer
303 views

Anti-automorphisms of matrix rings

1 vote
1 answer
149 views

Solutions to $f^{(4)}(x) =f(x )$

1 vote
1 answer
208 views

Every vector space is isomorphic to the vector space corresponding to some field extension.