Classical unified field theories since antisymmetry seemed essential for electromagnetism, the symmetry requirement was relaxed for one or both fields. Einstein's proposed unified-field equations (fundamental laws of physics) were generally derived from a variational principle expressed in terms of the Riemann curvature tensor for the presumed space-time manifold. In field theories of this kind, particles appear as limited regions in space-time in which the field strength or the energy density are particularly high. Einstein and coworker Leopold Infeld managed to demonstrate that, in Einstein's final theory of the unified field, true singularities of the field did have trajectories resembling point particles. However, singularities are
Unified Command of the area east of the canal (Egypt) Unified Command of the area east of the canal (Egypt) The Unified command of the area east of the canal is an Egyptian military formation. It groups the Second Field Army and the Third Field Army. A presidential Decree from Abdel Fattah al-Sisi appointed the command's first commander, Lieutenant General Osama Askar. The command was created to combat terrorism in the Sinai, and the unity of command and coordination between the second and third armies. President Abdel Fattah el-Sisi chaired a meeting of the Supreme Council of the Armed Forces in January 2015, during which he issued two declarations. The