Wave Propagation in Semiconductor Materials

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The book delves into the foundational developments of the mathematical theory of elasticity, beginning with Navier's pioneering work in 1821, which established key differential equations for isotropic elastic solids. It highlights how Cauchy later expanded on these ideas, introducing a formulation based on stress functions that simplifies the theory into six functions under equilibrium conditions. This historical context illustrates the evolution of elasticity theory, showcasing the contributions of both Navier and Cauchy to modern mathematical understanding of elastic materials.