Earlier Aronhold had worked on plane curves and the problem of the nine points of inflection of the third order plane curve which had been discussed by Plücker some time before.
Mas maaga Aronhold ay nagtrabaho sa eroplano kurva at ang mga problema ng siyam na puntos ng pagbabago ng tono ng eroplano ikatlong-order ng curve na had been tinalakay sa pamamagitan ng Plücker ilang oras bago.