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 picture info Unibody A vehicle frame, also known as its chassis, is the main supporting structure of a motor vehicle, to which all other components are attached, comparable to the skeleton of an organism. Until the 1930s virtually every car had a structural frame, separate from its body. This construction design is known as body-on-frame. Over time, nearly all passenger cars have migrated to unibody construction, meaning their chassis and bodywork have been integrated into one another [...More Info...]       [...Related Items...] Unitary Operator In functional analysis, a branch of mathematics, a unitary operator is a surjective bounded operator on a Hilbert space preserving the inner product. Unitary operators are usually taken as operating on a Hilbert space, but the same notion serves to define the concept of isomorphism between Hilbert spaces. A unitary element is a generalization of a unitary operator [...More Info...]       [...Related Items...] picture info Special Special or the specials or variation, may refer to: .mw-parser-output .tocright{float:right;clear:right;width:auto;background:none;padding:.5em 0 .8em 1.4em;margin-bottom:.5em}.mw-parser-output .tocright-clear-left{clear:left}.mw-parser-output .tocright-clear-both{clear:both}.mw-parser-output .tocright-clear-none{clear:none} Unitarity (physics) In quantum physics, unitarity is a restriction on the allowed evolution of quantum systems that ensures the sum of probabilities of all possible outcomes of any event always equals 1. Since unitarity of a theory is necessary for its consistency (it is a very natural assumption, although recently questioned), the term is sometimes also used as a synonym for consistency, and is sometimes used for other necessary conditions for consistency, especially the condition that the Hamiltonian is bounded from below. This means that there is a state of minimal energy (called the ground state or vacuum state) [...More Info...]       [...Related Items...] Unitary Representation In mathematics, a unitary representation of a group G is a linear representation π of G on a complex Hilbert space V such that π(g) is a unitary operator for every g ∈ G. The general theory is well-developed in case G is a locally compact (Hausdorff) topological group and the representations are strongly continuous. The theory has been widely applied in quantum mechanics since the 1920s, particularly influenced by Hermann Weyl's 1928 book Gruppentheorie und Quantenmechanik [...More Info...]       [...Related Items...] picture info Unitary Divisor In mathematics, a natural number a is a unitary divisor (or Hall divisor) of a number b if a is a divisor of b and if a and ${\displaystyle {\frac {b}{a}}}$ are coprime, having no common factor other than 1. Thus, 5 is a unitary divisor of 60, because 5 and ${\displaystyle {\frac {60}{5}}=12}$ have only 1 as a common factor, while 6 is a divisor but not a unitary divisor of 60, as 6 and ${\displaystyle {\frac {60}{6}}=10}$ have a common factor other than 1, namely 2 [...More Info...]       [...Related Items...] picture info Unitary Group In mathematics, the unitary group of degree n, denoted U(n), is the group of n × n unitary matrices, with the group operation of matrix multiplication. The unitary group is a subgroup of the general linear group GL(n, C). Hyperorthogonal group is an archaic name for the unitary group, especially over finite fields. For the group of unitary matrices with determinant 1, see Special unitary group. In the simple case n = 1, the group U(1) corresponds to the circle group, consisting of all complex numbers with absolute value 1 under multiplication. All the unitary groups contain copies of this group. The unitary group U(n) is a real Lie group of dimension n2---> [...More Info...]       [...Related Items...] Unitary Transformation In mathematics, a unitary transformation is a transformation that preserves the inner product: the inner product of two vectors before the transformation is equal to their inner product after the transformation. Unitary Matrix In mathematics, a complex square matrix U is unitary if its conjugate transpose U∗---> is also its inverse—that is, if ${\displaystyle U^{*}U=UU^{*}=I,}$ where I is the identity matrix [...More Info...]       [...Related Items...] picture info Lethal Unitary Chemical Agents And Munitions A chemical weapon (CW) is a specialized munition that uses chemicals formulated to inflict death or harm on humans. According to the Organisation for the Prohibition of Chemical Weapons (OPCW), "the term chemical weapon may also be applied to any toxic chemical or its precursor that can cause death, injury, temporary incapacitation or sensory irritation through its chemical action. Munitions or other delivery devices designed to deliver chemical weapons, whether filled or unfilled, are also considered weapons themselves." Chemical weapons are classified as weapons of mass destruction (WMDs), though they are distinct from nuclear weapons, biological weapons, and radiological weapons. All may be used in warfare and are known by the military acronym NBC (for nuclear, biological, and chemical warfare) [...More Info...]       [...Related Items...] Unitary Executive Theory The unitary executive theory is a theory of American constitutional law holding that the President possesses the power to control the entire executive branch. The doctrine is rooted in Article Two of the United States Constitution, which vests "the executive power" of the United States in the President. Although that general principle is widely accepted, there is disagreement about the strength and scope of the doctrine. It can be said that some favor a "strongly unitary" executive, while others favor a "weakly unitary" executive. The former group argue, for example, that Congress's power to interfere with intra-executive decision-making (such as firing executive branch officials) is limited, and that the President can control policy-making by all executive agencies within the limits set for those agencies by Congress [...More Info...]       [...Related Items...] picture info Unitary Authority A unitary authority is a type of local authority that has a single tier and is responsible for all local government functions within its area or performs additional functions which elsewhere in the relevant country are usually performed by national government or a higher level of sub-national government. Typically unitary authorities cover towns or cities which are large enough to function independently of county or other regional administration [...More Info...]       [...Related Items...]