JBorger's user avatar
JBorger's user avatar
JBorger's user avatar
JBorger
  • Member for 14 years, 5 months
  • Last seen more than a month ago
13 votes
Accepted

How to visualize a Witt vector?

4 votes
Accepted

Group schemes over ring of Witt vectors and their representing algebras

7 votes

Categories which are both monadic and comonadic over another category

3 votes

12th grade - Ramanujan Partition theory

16 votes
Accepted

Is an ordinary scheme in Borger's Absolute Geometry the same as a "scheme over 𝔽₁" with a map to Spec(ℤ)?

3 votes

Reference or a short argument that a certain subset generates the ring of p-typical symmetric functions under plethysm

15 votes

Why does Neeman avoid t-structures?

1 vote

Does a lisse $\ell$-adic sheaf give rise to an affine group scheme?

11 votes
Accepted

Descent of functions along finite birational morphisms

4 votes

What is the correct preposition? (And is there one?)

5 votes
Accepted

Vanishing cohomology of de-Rham Witt complex

11 votes

Ring with three binary operations

10 votes

Criteria for ghost-Witt vectors: looking for history and references

9 votes

Classification of plethories over $\mathbb{Q}$

9 votes
Accepted

$\lambda$-ring structure defined for a graded ring in Fulton–Lang's book

18 votes

Is the moduli space of curves defined over the field with one element?

16 votes
Accepted

Exact sequence of monoids

15 votes

What's the easiest example of a morphism of topoi that is not from that of a site?

125 votes

How has modern algebraic geometry affected other areas of math?

5 votes
Accepted

formally smooth => smooth

5 votes
Accepted

Module of Kahler differentials of rings of integers of number fields

38 votes
Accepted

Why are noetherian rings such natural objects in algebraic geometry?

12 votes
Accepted

On a Theorem of Fontaine

6 votes

Avatars of the ring of symmetric polynomials

6 votes

Langlands conjectures in higher dimensions

6 votes

Comparing colimits in schemes with colimits in sheaves of sets

7 votes

What is the definition of algebro-gemetric quotient?

3 votes

Does any research mathematics involve solving functional equations?

7 votes
Accepted

is quasicompact part of the definition of etale in EGA

21 votes

Problems where we can't make a canonical choice, solved by looking at all choices at once