Dirac may refer to:*people: Paul Dirac (1902–1984), a British theoretical physicist, Nobel laureate, and a founder of the field of quantum physics Gabriel Andrew Dirac (1925–1984), a graph theorist, Paul Dirac's stepson. in physics: Dirac bracket, a generalization of the Poisson bracket Dirac constant, another name for the reduced Planck constant Dirac delta function, a mathematical function introduced by British theoretical physicist Paul Dirac Dirac equation, a relativistic quant… (More on Dirac)