The Sisters

In mathematics, "The Sisters" refers to a famous set of four differential equations introduced by mathematician Mary Lucy Gatewood in 1913. These equations describe the flow of an incompressible, inviscid fluid and are notable for their complex, intertwined behavior. They are often studied in the context of fluid dynamics and partial differential equations, providing insights into turbulence and stability in fluid flows. While not as widely known as other mathematical models, they are an important example of how complex systems can be represented through elegant, detailed mathematical formulations.