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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.