For the rest of his career, although Gordan did not work exclusively on this topic, it would be fair to say that invariant theory dominated his mathematical research.
Para sa natitirang bahagi ng kanyang karera, bagama't Gordan ay hindi gumagana ng eksklusibo sa paksang ito, ito ay magiging makatarungan sa sabihin na invariant teorya ng kanyang duminado matematiko research.