Carlo Beenakker
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 Jan22 comment Definition of mth order stationarity this question is answered here: stats.stackexchange.com/questions/78120/… Sep24 awarded Autobiographer Jul13 comment Integer Solutions To Linear Equation khanacademy.org/math/arithmetic/fractions/Equivalent_fractions/… Jun30 comment Represent an integer as a sum of n non-consecutive squares hmm, does that answer the OP's question for any $n$? Jun8 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? Apr23 awarded Teacher Apr22 answered How to get transition matrix of markov process? Mar17 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. Mar13 awarded Commentator Mar12 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. Mar9 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 Mar8 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. Feb15 comment Laplace operator and Fourier transform this holds in any dimension, doesn't it? Jan26 comment Derivative of the norm of a second order tensor w.r.t. the tensor ...which paper? Dec22 comment Global convergence for Newton's method in one dimension isn't this answered here? mathoverflow.net/questions/148894 Dec3 awarded Supporter Nov10 comment f(x+C)/f(x) = const identifies potentiation? your "const" is not constant, it is $C$-dependent. Sep25 answered Show that ∇²(fg)=∇∙ (∇[fg] = f∇²g+g∇²f+2(∇f ∙ ∇g) Sep12 comment Integral with Dirac delta (me or wolfram mathematica?) with an answer on mathoverflow (I think Mathematica does just fine) Jul23 awarded Editor