bio  website  math.vt.edu/people/renardym 

location  Blacksburg, VA  
age  60  
visits  member for  4 years, 9 months 
seen  4 hours ago  
stats  profile views  3,218 
1d

reviewed  Approve Lower bounding the multiplicative order of 2 modulo p 
Jul
15 
comment 
Class of analyticallyintegrable divergencefree vector fields?
@Robert Bryant: It depends on what you mean by "explicit." On each level curve of the Hamiltonian, you have to solve an autonomous ODE in one dimension. This can always be done in terms of integrations and inverse functions. Of course, whether you can do those "explicitly" is another question, but one that is usually deemed at a "lower level." 
Jul
15 
answered  Class of analyticallyintegrable divergencefree vector fields? 
Jul
10 
comment 
The $L^2\times L^2\to L^2$ norm of the bilinear multiplier operator
Consider what happens when you set $m=\hat f\hat g$. 
Jul
10 
answered  Bandwidth approximation for a nonlinear problem 
Jul
7 
awarded  Good Answer 
Jun
23 
answered  Convergence of sequence of polynomials defined by boundary conditions 
Jun
19 
comment 
Infinitesimal generator is bounded
A much more serious flaw in your reasoning is that you are overlooking the fact that $t$ is in the denominator and $t\to 0$. 
Jun
17 
comment 
Is $f(x,y)=\sum_{n\in\mathbb{Z}\backslash\{0\}}\frac{1}{n}e^{2\pi i(xn+yn^2)}$ essentially bounded?
No. Set y=0. You can do the sum explicitly in that case. 
Jun
16 
reviewed  Edit for which values of $\theta$ does this equation $x_{n+1}=\cos(\theta)x^2_{n}\sin(\theta)x^2_{n1}$ have bounded solutions? 
Jun
16 
revised 
for which values of $\theta$ does this equation $x_{n+1}=\cos(\theta)x^2_{n}\sin(\theta)x^2_{n1}$ have bounded solutions?
The body text of the problem was so unregular. 
Jun
16 
comment 
[This might be a easy question]: A possible trace (inequality) defined under negative Sobolev scale
The problem is that if you pick $f\in H_0^{s+2}$, then $\partial f/\partial\nu$ will be zero on the boundary. 
May
29 
awarded  Good Answer 
May
26 
comment 
Existence of Solution steady navier stokes with do nothing outflow condition
First of all, the free boundary condition should be $pn\nu(\nabla u+(\nabla u)^T)n=0$. Second, what kind of existence results are you looking for? For small data, standard methods work. For large data, there is not much hope if there are free surfaces, as demonstrated by phenomena such as wave breaking, jet breakup etc. 
May
21 
comment 
Derivatives of radial functions can be bounded by derivatives in terms of radial distance?
This example does not quite seem to work. Does not $d^2f/dr^2$ get large when you actually do the modification near 0? 
May
20 
answered  Interpolation between weighted $L^p$ spaces 
May
13 
reviewed  Approve Loop space of manifold 
May
10 
comment 
Mixed (anisotropic) Sobolev spaces
The correct inference is that $f\in H^s(L^2)\cap L^2(H^s)$. You should look at the equivalent statement for Fourier transforms. 
May
10 
answered  Mixed (anisotropic) Sobolev spaces 
May
4 
reviewed  Approve oa.operatoralgebras tag wiki excerpt 