Navier's equation forms the starting point in Linear elasticity. And the simplest system seems to me as homogenous and isotropic material for which Navier's equation assumes simplest form. I would like to derive this equation.
Hi Ravi Gopal,
please consult the book Theory of Elasticity by A. I. Lurie. On the google books the pages 151-155 are visible, so you may follow the link
https://books.google.de/books?id=saEqz_LKkdEC&printsec=frontcover&dq=lurie+theory+of+elasticity&hl=de&sa=X&redir_esc=y#v=onepage&q=lurie%20theory%20of%20elasticity&f=false
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