did a few trivial edits regarding mathematical theory of physical elasticity. Created stubs for *stress tensor*, *strain tensor* and added pointers to the classical theoretical physics textbook

- Lev Landau, Evgeny Lifshitz,
*Theory of Elasticity*, part VII of*Course of Theoretical Physics*, 1959, 1970

Regarding the above discussion it seems useful to observe the following:

What Landau-Lifshitz by *default* speak about throughout their book is what more specifically is called *linear elasticity*, which is opposed to the *hyperelasticity* or even *plasticity* that, for what it’s worth, characterizes rubber.

In this respect the use specifically of *rubber* in “rubber sheet analogy” (for manifolds, for gravity) is indeed unfortunate. However, usage as in Landau-Lifshitz goes well along with the “gravity is ’an elasticity of space’”-anaogy of Misner-Thorne-Wheeler.

In view of all this the proposal to use *elasticity* for *differential cohesion* to go along with *cohesion* seems not too bad to me. In particular if we understand with Landau-Lifshitz the term to be short for *linear elasticity*, which via “linearity” matches nicely to what is expressed by differential cohesion.

inspection of the original sources shows that since we have an entry *cohesion* we should also have an entry *elasticity*. Created it with some minimum of pointers.