Quadrature over multiple cells


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12 days ago by
Hi,
I'm looking to implement, within Fenics, a Double Integral for Nonlocal Operators (ex. Fractional Laplacian).  I've read through some of the fenics book, and came across perhaps something similar circa page 500 in the section on linearization (and pitfalls).  I am wondering if what I've specifically mentioned regarding nonlocal operators exists as an example somewhere?

For example, a RHS of the form


The most basic form of this question is: how do I define an integral using values of u (displacement) from multiple cells?

Thanks,

Charlie



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