Paul Dirac

British theoretical physicist (1902–1984)

relativistic quantum mechanical wave equation

pseudo-function δ such that an integral of δ(x-c)f(x) always takes the value of f(c)

notation for quantum states

ground state of a fermionic field; thought of as a "sea" of negative-energy states that have been all filled in, thus rendering the vaccum stable

the hypothesis that the numerical similarity between the proton–electron gravitational force–electrical force ratio and the classical electron radius–age of the universe ratio is not a coincidence

Hungarian mathematician

Diffraction of matter by a standing wave of light

dual to the Dirac spinor