A question by Takagi led Iyanaga to prove a result which further led to his first paper on class field theory (and his third published paper while he was an undergraduate).
Ang isang katanungan sa pamamagitan ng Takagi humantong Iyanaga upang patunayan ang isang resulta kung saan pa na humantong sa kanyang unang papel sa klase field theory (at ang kanyang mga third-publish na papel habang siya ay isang undergraduate).