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Paul Dirac (1902–1984) was a Swiss-British theoretical physicist, Nobel laureate, and a founder of the field of quantum physics.
Dirac may also refer to:
- Dirac bracket, a generalization of the Poisson bracket
- Dirac constant, a reduced form of the Planck constant
- Dirac equation, a relativistic quantum mechanical wave equation
- Dirac notation, a standard notation for describing quantum states
- 5997 Dirac, a main-belt asteroid
- Dirac (software), a relativistic quantum chemistry program
- Dirac (video compression format), an open digital video codec developed by BBC Research
- Dirac, Charente, a commune of the Charente département, in France
- Dirac measure, a mathematical measure that is a probability measure
- Dirac observables, see loop quantum gravity
- Dirac delta function, a generalized mathematical function
- Gabriel Andrew Dirac (1925–1984), graph theorist, Paul Dirac's stepson
- Dirak, former name of the town Karnut, Armenia
- Fermi–Dirac (disambiguation)
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