Abstract
Bound states of two particles are described relativistically by a homogeneous 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 approximation and omit the D(I) part of δ+ function, energy levels are obtained relativistically as explicit functions of the constant. Difficulties which are met in the case of two spinor particles are discussed.
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