Rectangular Grid Coordinate Diagram - Mathematical Visualization #1994627 (License: Personal Use)

This diagram depicts a rectangular region in the xy-plane, partitioned into a uniform grid of cells, with boundaries at x = a (left), x = b (right), y = c (bottom), and y = d (top). It is commonly used to illustrate Riemann sums, double integrals, or area approximations in multivariable calculus. The grid structure supports discretization of continuous domains for numerical methods.

Used in educational math content, especially calculus textbooks and online tutorials on double integrals, iterated integrals, and numerical approximation. Matches user intent for visualizing integration bounds or domain partitioning.