A note on the optimal constants in Korn's and geometric rigidity estimates in bounded and unbounded domains Marta LewickaStefan Muller Indiana University Mathematics Journal 2016 text pdf 10.1512/iumj.2016.65.5797 10.1512/iumj.2016.65.5797 en Indiana Univ. Math. J. 65 (2016) 377 - 397 state-of-the-art mathematics http://iumj.org/access/