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 Nov 16 comment existence directional derivatives Do you know the definition of the directional derivative? Nov 12 awarded Yearling Nov 12 comment Which functions are in $C_0^\infty$, except for the Bump function Thanks for all the comments, I feel stupid for not realizing, that I could just combine $\phi$ with another function. If any of you would take the time to write your comment as an answer I will gladly accept it. Thanks! Nov 11 asked Which functions are in $C_0^\infty$, except for the Bump function Oct 14 revised Equation - what first? deleted 34 characters in body Sep 20 comment How can I find the convolution of these two functions? @B.Lee , I didn't go through the calculation, but I would split the integral at $t$, i.e. $\int_{-\infty}^\infty = \int_{-\infty}^t + \int_t^\infty$. Sep 20 comment How can I find the convolution of these two functions? I would consider the cases $t<0$, $t=0$ and $t>0$. Then you can split the integral with $t$ dependency. Aug 29 comment How do i evaluate $\bigtriangleup^{10}(1-ax)(1-bx^{2})(1-cx^{3})(1-dx^{4})$ I'm not exactly sure, what you are planning to do, but if the differentiation is of order 10, you might want to check the maximum order of your polynomial. Aug 6 revised Approximation of a negative exponential model? edited body Aug 6 answered Approximation of a negative exponential model? Aug 3 comment Consider the function f(x)=sin(x) in the interval x=[π/4,7π/4]. The number and location(s) of the local minima of this function are? The reason, why $\pi/4$ might sound confusing, is because it is no global minimum, but a local minimum at the left boundary. Aug 3 comment Consider the function f(x)=sin(x) in the interval x=[π/4,7π/4]. The number and location(s) of the local minima of this function are? Thanks for adding the local minima at $\pi/4$. +1 Jul 27 revised Finding $P(X < Y)$ where $X$ and $Y$ are independent uniform random variables added 1 character in body Jul 27 answered Finding $P(X < Y)$ where $X$ and $Y$ are independent uniform random variables Jul 19 comment Issues with finite-difference implicit solution of Advection-Diffusion-Reaction eqn Sadly, I can't run your code (even though numpy is installed) due to TypeError: gradient() got an unexpected keyword argument 'edge_order' . Jul 19 comment Issues with finite-difference implicit solution of Advection-Diffusion-Reaction eqn I can't access your code, but I requested authorization. It would be nice to see how you discretized $\partial_t u$ and $\nabla u$ and $\Delta u$. Jul 19 comment Issues with finite-difference implicit solution of Advection-Diffusion-Reaction eqn Do you use Upwind for your advection term? Jul 8 comment Is there any method that convert a concave problem into convex problem? Hey Tina, I edited your question, maybe you could make sure that the form of $f_2$ is still correct. Jul 8 revised Is there any method that convert a concave problem into convex problem? Latex introduced Jul 7 comment Help with greens function/fourier transformation to solve screened poisson equation That would be perfekt, my problem however is actually related to the fractional situation where I have $k^\alpha+\lambda^2$, but I would like to understand the integer case first. Thanks