However this interest was about to take a new turn, for in June 1925, with an extension of his Rockefeller Fellowship he arrived in Göttingen. Klein, a great mathematical hero of Struik's, died only days after Struik arrived in Göttingen to work with Courant . Courant approached Struik to prepare an edition of Klein 's lectures on the history of 19th century mathematics for publication.
Subalit ito ay tungkol sa mga interes na kumuha ng isang bagong turn, para sa Hunyo 1925, na may extension ng kanyang Rockefeller Fellowship siya dumating sa Gottingen. Klein, isang mahusay na matematiko bayani ng Struik's, namatay lamang araw matapos Struik dumating sa Gottingen sa trabaho sa Courant. Courant approached Struik upang maghanda ng isang edition ng Klein 's lektura sa kasaysayan ng ika-19 siglo matematika para sa publikasyon.