Generalized coordinate gauge, nonabelian Stokes theorem and the dual QCD Lagrangian

A coordinate gauge of general type is analyzed where the 1-form (vector potential) is expressed as a contour integral of the 2-form (field strength) along an arbitrary contour C. For a special class of contours the gauge condition reduces to tμ(x)Aμ(x)=0 where tμ(x) is a tangent vector to the contour C. As an application a simple proof of the nonabelian Stokes theorem is given and the dual QCD Lagrangian is derived.