Abstract
Bound states of two particles are described relativistically by a homo\Seneous integral equation. Its general properties and reduction to the non·relativistic equation are studied. In the case of scalar particles with scalar photon interaction, if we take the ladder approximation and omit the D(1) part of iJ + function, energy levels are obtained relativistically as explicit functions of the fine-structure constant. Difficulties which are met in the case of two spinor particles are discussed.
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