Redirected from P.A.M. Dirac
In 1926 he developed a version of quantum mechanics, which included “Matrix Mechanics” and “Wave Mechanics” as special cases.
In 1928, building on Pauli's work on nonrelativistic spin systems, he derived the Dirac equation, a relativistic equation describing the electron. This allowed Dirac to predict the existence of the positron, the electron's anti-particle; the positron was subsequently observed by Anderson in 1932. Dirac explained the origin of quantum spin as a relativistic phenomenon.
His Principles of Quantum Mechanics, published in 1930, pioneered the use of linear operators as a generalization of the theories of Heisenberg and Schrödinger. It also introduced the bra-ket notation, in which |ψ> denotes a state vector in the Hilbert space of a system and <ψ| its dual vector. Dirac also introduced Dirac's delta function.
He died in Tallahassee, Florida.