Abstract
An arbitrary parameter in the definition of the infrared asymptotics of the gluon propagator D ( k) ∼ M 2/( k 2) 2 in an axial gauge is shown to be fixed by boundary conditions in a coordinate space. The presence of the singularity of a quark propagator in the point p 2 = m 2 follows from the properties of the obtained gluon propagator. The last result forces us to consider seriously the possibility that coloured objects, first of all quarks, are in principle observable.
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