Gay-Balmaz, FrancoisRatiu, Tudor S.Tronci, Cesare2012-08-032012-08-032012-08-03201210.1007/s10440-012-9719-xhttps://infoscience.epfl.ch/handle/20.500.14299/84423WOS:000306332900007Nematodynamics is the orientation dynamics of flowless liquid-crystals. We show how Euler-Poincar, reduction produces a unifying framework for various theories, including Ericksen-Leslie, Luhiller-Rey, and Eringen's micropolar theory. In particular, we show that these theories are all compatible with each other and some of them allow for more general configurations involving a non vanishing disclination density. All results are also extended to flowing liquid crystals.NematodynamicsLiquid crystalsMicropolar theoryEricksen-Leslie equationLiquid-CrystalsSystemsFluidstext::journal::journal article::research article