The origin and evolution of double forms of German adjective in the historical grammar

This publication deals with the origin and evolution of double forms of German adjective that means the diachronic nature of the article. With a greater attention to the weak declension, which, in contrast to the strong Indo-European type, is a German innovation and, therefore, one of the most characteristic features of Germanic languages. The second part of the article reveals the essence of the principle of recognition / non-recognition of the influence of categorical trait “definity / indefinity” on the type of adjective declension (strong type – indefinite, weak type – definite), which divided Germanists into supporters of the semantic or syntactic conditioning of use of German adjective forms.