chemi colis daqalebi - cotnes axali partia | ჩემი ცოლის დაქალები - ცოტნეს ახალი პარტია
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The adjective abstract has often been applied to differential geometry before, but the abstract differential geometry (ADG) of this article is a form of differential geometry without the calculus notion of smoothness, developed by Anastasios Mallios and others from 1998 onwards.