What does this equation represents: a P = a W + a E + a S + a N − S P {"version":"1.1","math":"a_P=a_W+a_E+a_S+a_N-S_P"}

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The central node's coefficient in the case of 1 dimension diffusion problem considering that : a N = a S = 0 {"version":"1.1","math":"a_N=a_S=0"}

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The central node's coefficient in the case of 3-dimension diffusion problem

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The central node's coefficient in the case of 2-dimension diffusion problem

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The central node's coefficient in the case of 1 dimension diffusion problem

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