Refers to the surface area around the point (Node point) to calculate the integrals (Integral) the equation for the vector value that consists of the derivative of the equation for each substrate surface.
According to the area around the point (Node point) to calculate the integrals (Integral) equations comprising the vector of the surface of the substrate.
Refers to the surface area around the junction (Node point) calculation is integral (Integral) differential equations that consists of the vector of the surface equation of each surface.