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 Fire Authority contract cities in addition to the Unincorporated Salt Lake County. These cities wanted to play a more active role in the fire administration. In 2004, the department ceased operation as a County government entity and became the Unified Fire Authority. The Unified Fire Authority is the sponsoring agency of Urban Search and Rescue Utah Task Force 1, one of the 28 FEMA Urban Search and Rescue Task Forces in the United States. Managed daily by full-time staff of Unified Fire under the direction of the Federal Emergency Management Agency - Urban Search & Rescue, Response Directorate/Operations Division. Adopted Budget 2017