bio  website  people.ucsc.edu/~weissman 

location  Around and about  
age  38  
visits  member for  5 years 
seen  4 hours ago  
stats  profile views  5,484 
Associate Professor, YaleNUS College, Singapore.
Associate Professor of Mathematics, UC Santa Cruz. (On leave)
Research interests: Automorphic representations and representations of padic groups, especially exceptional groups and "metaplectic" groups lately. Theta correspondences (exceptional ones). Geometric methods in representation theory. Periods and Hodge theory. Model theory applied to number theory and geometry.
Book blog: Illustrated Theory of Numbers
6h

awarded  Yearling 
Nov 16 
comment 
Weil index computation, padic integral
These computations should be straightforward, using the explicit formulas of Ranga Rao. See the appendix of "On some explicit formulas in the theory of the Weil representation" in Pacific J. of Math., Vol. 157, No. 2, 1993. 
Nov 3 
comment 
What are the higher homotopy groups of a K3 suface?
A new entry in the encyclopedia of integer sequences, perhaps? 
Oct 28 
comment 
Visibility interpretation of Riemann zeta zeros on the critical line?
You forgot to mention, the fraction of $\mathbb Z$ lattice points visible from the origin is $1 / \zeta(1) = 0$. 
Oct 26 
comment 
Does every smooth, projective morphism to $\mathbb{C}P^1$ admit a section?
@Jason: But I guess that by removing a bunch of codim 1 subvarieties from Y, we'd get something $U$ which is "anabelian" or "hyperbolic" in some sense of the word. Then a rational section (existing by anabelian section conjecture) from $P^1 C \rightarrow U$ would extend to a regular section $P^1 C \rightarrow Y$. Again, all contingent on some anabelian conjectures that I don't fully understand. 
Oct 25 
comment 
Does every smooth, projective morphism to $\mathbb{C}P^1$ admit a section?
Does this follow from some anabelian conjecture? From such a conjecture, we might expect rational sections $P^1 C \rightarrow Y$ to arise from sections of $Gal(Y) \rightarrow Gal(P^1 C)$ (abs. Galois group of function fields). It's known (Harbater, Pop, Haran, I think) that $Gal(P^1 C)$ is profinite free, and so sections exist. A rational section $P^1 C \rightarrow Y$ gives a regular section by the valuative criterion, right? Or perhaps a counterexample to this type of anabelian conjecture provides a counterexample here? 
Sep 22 
awarded  Enlightened 
Sep 15 
comment 
Results true in a dimension and false for higher dimensions
Every cubic polynomial map from $\mathbb C^n$ to $\mathbb C^n$ with nowhere vanishing Jacobian is a bijection. This is true for $n \leq 17$ but fails for larger $n$. Just kidding... but perhaps someday I'll edit the answer, change 17 appropriately and will gain some upvotes. 
Sep 5 
comment 
Recognize this strange expression from linear algebra?
Ahh  or arrgh.. This gets more interesting though. I'll think about how to phrase things in terms of a cocycle. And please don't take offense for the removal of acceptance. I'm also hoping that someone might recognize it from another context and contribute another answer. 
Sep 3 
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Recognize this strange expression from linear algebra?
Wonderful, thank you! (And you did say "cocycle".) 
Sep 2 
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Recognize this strange expression from linear algebra?
Nick  I can only take credit for the pastarelated one. But I'll keep the other to maximize the tagcontribution. 
Sep 2 
awarded  Nice Question 
Sep 2 
asked  Recognize this strange expression from linear algebra? 
Aug 29 
answered  Are the quaternions not uncountably categorical? 
Aug 16 
awarded  Enlightened 
Aug 13 
comment 
What is the analogue of simple prime closed geodesic for prime numbers?
Birman and Series (J. Lond Math Soc 1984) characterize nonselfintersection of a closed loop via a grouptheoretic property of the corresponding element in the fundamental group. Their characterization depends on the Nielesen generators available for $\pi_1$ of cpt orientable surfaces with nonempty bdry. Wild out of the blue idea: try something similar, with Frobenius at $p$, and the usual generators of the GrothendieckTeichmuller group. 
Aug 8 
comment 
Examples of research on how people perceive mathematical objects
Have you seen George Lakoff, "Where mathematics comes from?" He's a cognitive linguist at Berkeley, wellknown for work on metaphor. See amazon.com/WhereMathematicsComeFromEmbodied/dp/0465037712 
Jul 2 
awarded  Curious 
Jun 26 
awarded  Nice Answer 
Jun 6 
revised 
How to estimate the Haar measure on $G_2$
expressed my growing confidence :p 