%0 Journal Article %T Smooth Loops and Thomas Precession %A Alexander I. Nesterov %A Lev V. Sabinin %J Physics %D 2013 %I arXiv %X Fundamentals of the local smooth loops due to Sabinin are concisely outlined together with the corresponding infinitesimal objects, so-called \nu-hyperalgebras, and the analogue of the Lie groups theory. We apply here this theory to to formulation of a new concept of loop of boosts. A quaternionic model of the three-parametric loop of boosts is obtained and a remarkable connection with geodesic loops of Lobachevskii space is found. A description of Thomas precession in the light of general theory of smooth loops is given. %U http://arxiv.org/abs/1304.7763v1