<blockquote style="padding-left: 5px; margin-left: 5px; border-left: 2px solid rgb(160, 198, 229); margin-right: 0px;">Some nonlocal phenomenon such as band to band tunneling in semiconductor.<br><br><blockquote><p>an integral boundary condition with dynamic integration range<br>
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<p>Isn't there a maximum possible stencil for that boundary node? Why not preallocate for all of those and keep typical sparsity for the rest of the matrix?</p>
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