Question: Assumption ignored while solving integral

Hi folks,

I'm trying to get the fundamental solution of


I had some troubles entering the code here, so I uploaded the maple commands here:

when I call eval(phi(x,t,xi,tau));  to calculate the fundamental solution, I always get the error 'Error, (in w) numerical exception: division by 0'.

Shouldn't my assumptions avoid this error?

Thanks for your hints!


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