... the importance of symmetries in gravity.For illuminating comments and criticisms on a preliminary version of themanuscript, I wish to thank my colleagues Tatjana Vukaˇsinac, Milovan Vasili´c,DjordjeˇSijaˇcki, ... from classical mechanics and electrodynamics, and its influence on the structure of space and time; and the formulation of the principle of equivalence, and the introduction of gravitation and ... World in Eleven DimensionsSupergravity, Supermembranes and M- TheoryEdited by M J DuffGravitational WavesEdited by I Ciufolini, V Gorini, U Moschella and P Fr´e Gravitation and geometry17influenced...