Airy, Beltrami, Maxwell, Morera, Einstein and Lanczos potentials revisited

Understand

The main purpose of this paper is to revisit the well known potentials, called stress functions, needed in order to study the parametrizations of the stress equations, respectively provided by G.B.

• Airy (1863) for 2-dimensional elasticity, then by E.
• Beltrami (1892), J.C.
• Maxwell (1870) and G.