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The detailed consideration of the relativistic canonical quantum-mechanicalmodel of an arbitrary spin-multiplet is given. The group-theoretical analysisof the algebra of experimentally observables physical quantities for the spin1/2 doublet is presented. It is shown that both the Foldy-Wouthuysen equationfor the fermionic spin 1/2 doublet and the Dirac equation in its localrepresentation are the consequences of the relativistic canonical quantummechanics of the corresponding doublet. The mathematically well-definedconsideration on the level of modern axiomatic approaches to the field theoryis provided. The hypothesis of the antiparticle negative mass is discussedbriefly in the section conclusions.

The Schrodinger-Foldy relativistic canonical quantum mechanics and the derivation of the Dirac equation