Evolutionary forms, as well as exterior forms, are skew-symmetricdifferential forms. But in contrast to the exterior forms, the basis ofevolutionary forms is deforming manifolds (with unclosed metric forms). Suchforms possess a peculiarity, namely, the closed inexact exterior forms areobtained from that. The closure conditions of inexact exterior form (vanishing the differentialsof exterior and dual forms) point out to the fact that the closed inexactexterior form is a quantity conserved on pseudostructure having the dual formas the metric form. We obtain that the closed inexact exterior form andcorresponding dual form made up a conservative object, i.e. a quantityconserved on pseudostructure. Such conservative object corresponds to theconservation law and is a differential-geometrical structure. Transition from the evolutionary form to the closed inexact exterior formdescribes the process of generating the differential-geometrical structures.This transition is possible only as a degenerate transformation, the conditionof which is a realization of a certain symmetry. Physical structures that made up physical fields are suchdifferential-geometrical structures. And they are generated by material systems(medias). Relevant symmetries are caused by the degrees of freedom of materialsystem.
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