Thank you for your help
With
    g(x) = heaviside(f(x)) * f(x)
plotting seems to work correctly in all cases.
However
    solve([g(x)==y,y==4],[x,y])
still does not work. Of course I could simply do g(4), but I'm providing a 
simplified exemple of a more general and complicated case. My point is: is 
sagemath able to solve systems of equation with heaviside in their 

Finally, where can I find documentation and understand better the difference 
between python and sage function? I thought they could be used interchangeably

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