The study of position and gravitational vector fields highlights the fundamental principle of coordinate invariance, where physical properties like divergence and curl remain consistent across Cartesian, cylindrical, and spherical systems. While the position vector $\vec{x}$ represents a uniform expansion with a constant divergence of 3, the gravitational field $\vec{g}$ demonstrates a piecewise nature, acting as a constant sink inside a solid mass and becoming solenoidal in a vacuum. Despite these differences in source behavior, both fields are characterized by a curl of zero, confirming their identities as irrotational and conservative systems where the path of movement does not influence the work performed. This comparison underscores how the transition from linear geometry to inverse-square laws—as seen in the shift from the position vector to gravity—redefines the Laplacian from a simple null result to the complex Poisson equation governing mass density and spatial curvature.
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