Zermelo made other fundamental contributions to axiomatic set theory which were partly a consequence of the criticism of his first major contribution to the subject and partly because set theory began to become an important research topic at Göttingen.
Zermelo ginawa iba pang mga pangunahing kontribusyon sa axiomatic set theory na kung saan ay bahagyang resulta ng pamumuna ng kanyang unang malaking kontribusyon sa paksa at bahagyang dahil set theory ay nagsimulang maging isang mahalagang paksa ng pananaliksik sa Gottingen.