Leray projection

The Leray projection is a mathematical tool used to describe the motion of fluids like air or water. It takes a vector field—essentially a description of how something moves at each point in space—and extracts the part that represents incompressible (divergence-free) flow. This is especially useful in studying fluid dynamics, such as in the Navier–Stokes equations that describe how fluids move.

It is named after Jean Leray.

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