Fubini's theorem: double integral evaluated as iterated 1D integrals in Cartesian coordinates
This program illustrates Fubini’s theorem by showing how a double integral over a rectangular region can be computed as an iterated integral: first integrating with respect to one variable while holding the other fixed, then integrating the result. The intermediate step is displayed as a cross-sectional area that sweeps across the domain, and the math.js library evaluates the user-defined integrand.
Controls: Click and drag to orbit, scroll to zoom.
