Questions tagged [diracdelta]
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Plot of Density of States Using DiracDelta Function [duplicate]
I am trying to plot the density of states $$ N(E)= \frac{1}{N}\Sigma_{k} (\delta{(E - \epsilon_{k}))} $$ where $\epsilon_{k} = -2t*[cos(k_x)+cos(k_y)]$ and $k$ goes from $-\pi$ to $\pi$. For this plot,...
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Issue about simplify dirac delta function [duplicate]
When I trying to simplify a dirac delta equation, I got the following result. The result confused me. How can I make the second equation output true
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`FullSimplify` is failing to combine terms with `DiracDelta` functions
DiracDelta[x] + Pi DiracDelta[x] == (1 + Pi) DiracDelta[x] is obviously true by inspection. And yet, ...
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Speed up the integration of HeavisideTheta over the range from zero to infinity
The problem is described in the following figure. Mathematica version 14.0, OS windows 10 LTSC.
The integration interval is [0,infinity), and the value of HeavisideTheta in the point 0 is 0. we can ...
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