noether's suggestion that topology be studied algebraically was adopted immediately by hopf, alexandrov, and others, and it became a frequent topic of discussion among the mathematicians of göttingen. noether observed that her idea of a betti group makes the euler–poincaré formula simpler to understand, and hopf's own work on this subject "bears the imprint of these remarks of emmy noether". noether mentions her own topology ideas only as an aside in a 1926 publication, where she cites it as an application of group theory.