For 10 points, identify this scientist who proposed the existence of antiparticles.
The Shah function consists of a set of uniformly spaced functions named for this man. That function is the derivative of the Heaviside step function, and is frequently used for its "sifting" property. He developed a notation whose two components can be used to denote the inner product, and he also proposed the existence of a "sea" of negative energy eigenstates. An equation developed by this man describes the relativistic motion of spin 1/2 particles based on 4-component wavefunctions, and is a relativistic generalization of the Schrodinger wavefunction. That equation also suggested the existence of positrons. For 10 points, identify this scientist who proposed the existence of antiparticles.
The Shah function consists of a set of uniformly spaced functions named for this man.
Paul Adrien Maurice {Dirac}