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Stefan Kohl's user avatar
Stefan Kohl's user avatar
Stefan Kohl
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  • Member for 12 years, 1 month
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revised
Major applications of the internal language of toposes
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comment
Show that a polynomial of degree 4 is birational equivalent to a polynomial of degree 3
Please do not cross-post questions simultaneously to more than one site.
awarded
 Yearling
comment
How to characterize the images of disk-algebra functions?
@ray The matter is that comments are comments and answers are answers. The distinction is by content rather than by length.
revised
Is it true that $\lVert A\rVert \leq \lVert A^2\rVert$ for $A\in \operatorname{SL}(2, \mathbb{R})$ when $\operatorname{trace}(A)>2$?
rolled back to a previous revision
revised
Is it true that $\lVert A\rVert \leq \lVert A^2\rVert$ for $A\in \operatorname{SL}(2, \mathbb{R})$ when $\operatorname{trace}(A)>2$?
rolled back to a previous revision
comment
How to characterize the images of disk-algebra functions?
@ray Comments should be posted as comments, and not as answers. -- If your text is too long (i.e. longer than 600 characters), you can post multiple comments. In your case, two comments provide sufficient space.
comment
Is the derivative of $x^n + x^{n-1} + \dots + x + 1$ irreducible?
I checked this with GAP for $n \leq 230$. -- No counterexample found up to that bound.
revised
Examples of finite dimensional non simple non abelian Lie algebras
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revised
Graded analogues of theorems in commutative algebra
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revised
Open problems in symbolic dynamics
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awarded
 Nice Answer
answered
Taking a theorem as a definition and proving the original definition as a theorem
revised
Geometric or topological results from group theory
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revised
How can I tell if a group is linear?
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revised
Mathematical computing rules-of-thumb
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revised
Examples of amenable groups other than finite groups
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revised
What topics should be included in a calculus-for-the-liberal arts course?
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comment
Existence/uniqueness of the solution to some SDE with discontinuous coefficient
When editing a post that many times, please provide at least meaningful edit summaries (i.e. not just "added xyz characters in body"). -- Please remember -- each edit bumps the thread to the top of the front page.
revised
Equivalence relations not associated with a group
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