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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeFeb 27th 2015
   • PermaLink
   Author: Urs
   Format: MarkdownItexinspection 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.

   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.

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeMar 10th 2015
   • (edited Mar 10th 2015)
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   Author: Urs
   Format: MarkdownItexdid 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](http://ncatlab.org/nlab/show/elasticity#MisnerThorneWheeler73). 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.

   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.