3,773 reputation
11228
bio website personal.psu.edu/jwh6013
location Chicago
age 30
visits member for 5 years, 1 month
seen Aug 25 at 16:15

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