bio | website | personal.psu.edu/jwh6013 |
---|---|---|
location | Chicago | |
age | 30 | |
visits | member for | 5 years, 1 month |
seen | Aug 25 at 16:15 | |
stats | profile views | 2,293 |
I'm an assistant professor at Penn State working on algebraic geometry.
Jul
23 |
awarded | Pundit |
Jul
7 |
awarded | Yearling |
Jun
29 |
reviewed | Approve Generalization of Popoviciu's inequality |
Jun
27 |
reviewed | Approve Quick proof of the fact that the ring of integers of Q(\zeta_n) is Z[\zeta_n]? |
Feb
26 |
awarded | Nice Answer |
Dec
16 |
reviewed | Approve On Prüfer domains |
Sep
7 |
awarded | Good Answer |
Aug
11 |
reviewed | Approve Integral Fredholm equation of the second type |
Jul
7 |
awarded | Yearling |
Jun
22 |
reviewed | Approve Verdier localization for stable $\infty$-categories |
May
7 |
comment |
Is there a name for a “rigid” sheaf?
The term "rigid sheaf" would potentially be confused with the notion of rigidity from deformation theory: a sheaf is rigid if it has no first order deformations, i.e. if $\mathrm{Ext}^1(F,F)=0$. I'm not sure of a term for what you are considering. |
Mar
7 |
comment |
Sum of digits of repeating end of reciprocal of prime over period is $\frac{9}{2}$
About 2/3rds of the first 10000 primes satisfy the property. |
Mar
7 |
comment |
Sum of digits of repeating end of reciprocal of prime over period is $\frac{9}{2}$
It's false for $p=31$. I can't really explain why it holds for smaller $p$, besides that $9/2$ should be the most common average digit value since it is the average of the 10 base 10 digits. |
Mar
6 |
comment |
why do automorphisms preserve ample divisors?
Consider $\mathbb{P}^1\times \mathbb{P}^1$ embedded by an "unbalanced" divisor. The involution does not act trivially on the divisor. |
Feb
18 |
answered | Sheaves with no cohomology |
Jan
30 |
awarded | Citizen Patrol |
Jan
28 |
reviewed | Approve Union of Permutations |
Jan
28 |
reviewed | Close Why can't I get global existence to linear PDE in this way? |
Jan
28 |
reviewed | Close Fermat pseudo prime base-3 |
Jan
28 |
reviewed | Close Lemma about infinite sequences we are hoping is true |