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In both cases, one is "solving" the "same" problem j --> .25 (jleft +jright + jup + jdown)
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over a set of points
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In sequential case, problem is "solved" over the full domain
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In parallel case, problem is "solved" over part of domain (roughly one sixteenth of it) i.e. each node is solving same problem as sequential case but over a different - smaller geometry
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In sequential case, boundary conditions are "just" fixed values on the edge
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In the parallel case, boundary conditions are in addition, communicated values
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