The document discusses Cauchy Riemann equations, including its history, important features, definition, and applications. It was discovered in 1851 by Augustin Cauchy and Bernhard Riemann during work on the theory of functions. The equation is used to check the differentiability and analyticity of complex functions. It has applications in engineering fields like triangular grid generation for computational fluid dynamics simulations. It also has applications in verifying Maxwell's equations and calculating fluid intensity and divergence.