N'asụsụ nke symmetry: ebe gravity nwere ike na-eleghara anya, physics bụ Lorentz invariant dị ka pụrụ iche ikwu kama Galilei invariant dị ka na classical mechanics. (The akọwa symmetry nke pụrụ iche ikwu bụ Poincaré ìgwè, nke na-agụnye translations, rotations na boosts.) The ọdịiche dị n'etiti abụọ na-aghọ ịrịba ama mgbe emeso ọsọ na-eru nso ọsọ nke ìhè, na na elu-ike phenomena.With Lorentz symmetry, ọzọ owuwu-abịa n'ime play. Ha na-kọwara site na set nke ìhè cones (conusal oyiyi). The ìhè-conusal oyiyi akọwa a owuwu: maka onye ọ bụla ihe omume e nwere ụkpụrụ nke mmetụta, ma na pụrụ iche ikwu ikwu ikwu karịa na klasik mechanics.
Òtù Poincaré