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Jan
22
comment Definition of mth order stationarity
this question is answered here: stats.stackexchange.com/questions/78120/…
Sep
24
awarded  Autobiographer
Jul
13
comment Integer Solutions To Linear Equation
khanacademy.org/math/arithmetic/fractions/Equivalent_fractions/…
Jun
30
comment Represent an integer as a sum of n non-consecutive squares
hmm, does that answer the OP's question for any $n$?
Jun
8
comment Heat transfer: boundary conditions with fluid velocity
@mkl314 --- perhaps this discussion (on whether the $v\cdot n$ in the boundary condition should be multiplied by $u$ or by $u-u_b$) can be settled by just considering what would happen if you would open a window in your room; there's a draft ($v\cdot n\neq 0$), but the temperature inside and outside is the same ($u=u_b$). Surely one would not expect a temperature gradient to appear?
Apr
23
awarded  Teacher
Apr
22
answered How to get transition matrix of markov process?
Mar
17
comment problem computing block inverse of factorized matix
then $U_1 U_1^T=1$, but you need $U_1^T U_1 =1$, which it's not.
Mar
13
awarded  Commentator
Mar
12
comment Equality that should be a consequence of Plancherel formula
just use that the Fourier transform with respect to $x$ of $u(x+y)$ is $e^{iy\xi}\hat{u}(\xi)$ and then apply Plancherel as usual.
Mar
9
comment problem computing block inverse of factorized matix
ask yourself what are the dimensions of $S$, $U$, $U_1$ and $U_2$, and you'll see your decomposition is not possible
Mar
8
comment problem computing block inverse of factorized matix
if you decompose $U$ into blocks you need four blocks, $U=\{\{B_1,B_2\},\{B_3,B_4\}\}$; none of the four blocks $B_n$ is unitary.
Feb
15
comment Laplace operator and Fourier transform
this holds in any dimension, doesn't it?
Jan
26
comment Derivative of the norm of a second order tensor w.r.t. the tensor
...which paper?
Dec
22
comment Global convergence for Newton's method in one dimension
isn't this answered here? mathoverflow.net/questions/148894
Dec
3
awarded  Supporter
Nov
10
comment f(x+C)/f(x) = const identifies potentiation?
your "const" is not constant, it is $C$-dependent.
Sep
25
answered Show that ∇²(fg)=∇∙ (∇[fg] = f∇²g+g∇²f+2(∇f ∙ ∇g)
Sep
12
comment Integral with Dirac delta (me or wolfram mathematica?)
with an answer on mathoverflow (I think Mathematica does just fine)
Jul
23
awarded  Editor