Mordell submitted his subsequent work on indeterminate equations of the third and fourth degree when he became a candidate for a Fellowship at St John's College, but he was not successful.
Mordell na isinumite sa kanyang trabaho sa mga susunod na walang katiyakan equation ng ikatlo at ikaapat na degree kapag siya ay naging isang kandidato para sa isang Fellowship sa St John's College, ngunit siya ay hindi matagumpay.