Classical unified field theories describe the properties of the electromagnetic field as a purely geometric phenomenon. Einstein tried to form a generalized theory of gravitation that would unify the gravitational and electromagnetic forces (and perhaps others), guided by a belief in a single origin for the entire set of physical laws. These attempts initially concentrated on additional geometric notions such as vierbeins and "distant parallelism", but eventually centered around treating both the metric tensor and the affine connection as fundamental fields. (Because they are not independent, the metric-affine theory was somewhat complicated.) In general relativity, these fields are symmetric (in the matrix sense), but
Unified budget Unified budget In the United States a unified budget is a federal government budget in which receipts and outlays from federal funds and the Social Security Trust Fund are consolidated. The change to a unified budget resulted in a single measure of the fiscal status of the government, based on the sum of all government activity. When these fund groups are consolidated to display budget totals, transactions that are outlays of one fund group (i.e., interfund transactions) are deducted to avoid double counting. The United States government adopted a unified budget in the Johnson administration in 1968, beginning with the