2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193916The validity of the Bianchi identity, which is intimately connected with the zig zag symmetry, is established, for piecewise continuous contours, in the context of Polakov's gauge field-string connection in the large 'tHooft coupling limit, according to which the chromoelectric `string' propagates in five dimensions with its ends attached on a Wilson loop in four dimensions. An explicit check in the wavy line approximation is presented.24 pages version to appear in EPJCHigh Energy Physics - Theorytext