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R. van Dobben de Bruyn's user avatar
R. van Dobben de Bruyn's user avatar
R. van Dobben de Bruyn's user avatar
R. van Dobben de Bruyn
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I am currently based at Universiteit Utrecht. My main interest is algebraic geometry, especially in positive and mixed characteristic.

Here's a random answer: What are supersingular varieties?

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49
SOS polynomials with integer coefficients
May 29, 2020
46
Pros and cons of specializing in an esoteric research area
Mar 7, 2020
38
How and when do I learn so much mathematics?
Mar 9, 2020
37
When is the tensor product of two fields a field?
Feb 12, 2020
37
Non-isomorphic rings that are localizations of each other
Jun 20, 2016
32
Is there a relationship between a quotient group of the fundamental group of X and the fundamental group of a quotient topology of X?
Feb 17, 2018
30
Are there any other examples where "weak" and "strong" are confused in mathematics?
Mar 17, 2023
27
Reference for de Rham cohomology in positive characteristic
Oct 31, 2015
27
What spaces $X$ do have $\text{End}(X) \cong \text{End}(\mathbb{R})$?
Mar 30, 2020
25
Is a scheme Noetherian if its topological space and its stalks are?
Dec 9, 2018
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MathOverflow updated site theme is ready for testing!
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A StackExchange website aimed at graduate students?
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22
What is the importance of modules in algebraic geometry?
19
What is the geometric meaning of representability?
16
Hom / tensor adjunction for $O_X$ modules?
15
Zariski topology and product topology on $\mathbb A_k^m \times \mathbb A_k^n$