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A creation operator (usually denoted ^ †) increases the number of particles in a given state by one, and it is the adjoint of the annihilation operator. In many subfields of physics and chemistry, the use of these operators instead of wavefunctions is known as second quantization.
In linear algebra (and its application to quantum mechanics), a raising or lowering operator (collectively known as ladder operators) is an operator that increases or decreases the eigenvalue of another operator.
In December 2017 a deal for Qatar to buy 24 jets and a support and training package from BAE was announced, scheduled to begin in 2022. In September 2018, Qatar made the first payment for the procurement of 24 Eurofighter Typhoons and nine BAE Systems Hawk aircraft to BAE.
Airline operators. As of March 2024, there were 415 Boeing 747 aircraft in active airline service, comprising 1 747-100, 3 747SPs, 20 747-200s, 3 747-300s, 236 747-400s, and 152 747-8s. These aircraft are listed by airline operators and variant in the following table.
The Lockheed Martin/Boeing F-22 Raptor is an American twin-engine all-weather stealth fighter aircraft developed and produced for the United States Air Force (USAF). As a product of the USAF's Advanced Tactical Fighter (ATF) program the aircraft was designed as an air superiority fighter, but also incorporates ground attack, electronic warfare ...
There are many companies operating trains in the United Kingdom, including the operators of franchised passenger services, officially referred to as train operating companies (TOCs), as distinct from freight operating companies.
A reactor operator (or nuclear reactor operator) is an individual at a nuclear power plant who is responsible for directly controlling a nuclear reactor from a control panel and is the only individual at a nuclear power plant who can directly alter significant amounts of reactor reactivity. The reactor operator occupies a position of great ...
In quantum mechanics, the momentum operator is the operator associated with the linear momentum. The momentum operator is, in the position representation, an example of a differential operator . For the case of one particle in one spatial dimension, the definition is:
In physics, a superoperator is a linear operator acting on a vector space of linear operators. Sometimes the term refers more specially to a completely positive map which also preserves or does not increase the trace of its argument.
In mathematics, an integration by parts operator is a linear operator used to formulate integration by parts formulae; the most interesting examples of integration by parts operators occur in infinite-dimensional settings and find uses in stochastic analysis and its applications. Definition