>
> Ok, i see this isn't implemented yet. But could you give me a hint why 
> while the last plot the kernel is busy all the time ?
>


import sympy
from sympy.plotting import plot
from sympy.abc import t,tau

u_t = 2 * DiracDelta(t)
g_t = 0.5 * ( Heaviside(t)-Heaviside(t-2) )

plot( integrate( u_t.subs(t,tau)*g_t.subs(t,t-tau), (tau,-10, 10)), 
(t,-10,10))
plot( integrate( u_t.subs(t,tau)*u_t.subs(t,t-tau), (tau,-10, 10)), 
(t,-10,10))
plot( integrate( g_t.subs(t,tau)*g_t.subs(t,t-tau), (tau,-10, 10)), 
(t,-10,10)) 

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