# Tagged Questions

Fields of characteristic $p$, i.e., fields for which there is a prime $p$ such that $px=0$ for each $x$. Do not use this tag for questions on characteristic polynomials of a matrix.

**11**

**2**answers

### Residues of $\frac{1}{\prod_{i=1}^n (x-P_i)^{e_i}}$

**9**

**1**answer

### Existence of certain endomorphism of supersingular elliptic curve

**16**

**1**answer

### Lang's Jacobian identity: slicker, elementary proof?

**15**

**0**answers

### A linear algebra problem in positive characteristic (2)

**4**

**0**answers

### Symmetric power contained in tensor power?

**18**

**1**answer

### A linear algebra problem in positive characteristic

**5**

**1**answer

### Restricted Lie algebras with no nonzero proper restricted subalgebras

**4**

**1**answer

### A generalization of Witt's theorem for quaternion algebra isomorphism

**4**

**0**answers

### Quaternion algebras in characteristic 2

**2**

**0**answers

### Indecomposablity in purely inseparable extensions

**7**

**3**answers

### Lefschetz fixed-point theorem for the Frobenius map

**4**

**2**answers

### On families of supersingular abelian surfaces over the projective line

**5**

**0**answers

### Map associated to linear system onto curve is morphism

**16**

**2**answers

### A short proof for simple connectedness of the projective line

**11**

**0**answers

### A slick proof (?) of Zariski-Nagata purity in characteristic $p$

**3**

**1**answer

### Restriction of separable map

**2**

**0**answers

### Does the sheaf of locally exact differential forms splitting in positive characteristic

**5**

**0**answers

### Torsionfree crystalline cohomology implies torsionfree etale cohomology?

**1**

**0**answers

### Smoothability of stable curves in mixed characteristic

**1**

**0**answers

### Examples of semi-stable models of curves

**3**

**1**answer

### Harish-Chandra isomorphism for characteristic $p$

**2**

**0**answers

### Purely inseparable $k$-rational dominant maps between an absolutely irreducible $k$-surface and $\mathbb{P}^2$

**12**

**0**answers

### Elkies' supersingularity theorem in higher dimension (in terms of the associated Newton polygon)

**0**

**1**answer

### Authomorphisms of factoralgebra A_5 over its center in characteristic 2

**4**

**0**answers

### Application of Frobenius splitting in characteristic $0$

**23**

**1**answer

### Reference for de Rham cohomology in positive characteristic

**4**

**1**answer

### How do non-trivial global differentials give non-trivial cohomology classes in positive characteristic

**4**

**1**answer

### Lifting torsors in characteristic $p$ to characteristic zero

**7**

**1**answer

### Mod 2 modular forms in levels 5 and 25--how to account for this Hecke isomorphism?

**7**

**0**answers

### Are curves over imperfect fields defined over a smaller field?

**3**

**1**answer

### Two spaces attached to mod 2 level 9 modular forms--a conjectural Hecke isomorphism

**2**

**1**answer

### A question about decomposing mod 2 modular forms of level p^2

**8**

**0**answers

### Degeneration of wildly ramified local monodromy representations - near or far from Deligne?

**4**

**1**answer

### Motivic integration in positive characteristic: how much is known?

**13**

**2**answers

### Is there a proof of Warning's Second Theorem using p-adic cohomology?

**6**

**1**answer

### Recursions for some binary theta series in characteristic 3

**4**

**0**answers

### Partial differential Equation over characteristic p

**3**

**1**answer

### Embedded resolution of curves on smooth varieties

**3**

**1**answer

### Mumford-Ramanujam examples in characteristic p [and in Arakelov geometry]

**9**

**2**answers

### Applications of alterations

**11**

**1**answer

### Extended Deformation Theory (dg-Lie algebra principle in positive characteristic?)

**7**

**0**answers

### Invariant theory of $SL_2$ over a field of positive characteristic

**8**

**2**answers

### Representations of $SL(2)$ in characteristic 2

**5**

**0**answers

### Nori fundamental group and etale fundamental group in positive characteristic

**14**

**1**answer

### The “Level N modular equation for delta” in characteristics 3, 5, 7 and 13

**13**

**0**answers

### Katz--Mazur for abelian varieties

**11**

**1**answer

### Do varieties with ample canonical bundle have finite automorphism group in small characteristic?

**11**

**0**answers

### Why was it so difficult to define the relative de Rham-Witt complex?

**1**

**0**answers

### Vanishing theorems that work in positive characteristic

**2**

**1**answer