In the second epoch (1920–1926), Noether devoted herself to developing the theory of mathematical rings. In the third epoch (1927–1935), Noether focused on noncommutative algebra, linear transformations, and commutative number fields. Although the results of Noether's first epoch were impressive and useful, her fame among mathematicians rests more on the groundbreaking work she did in her second and third epochs, as noted by Hermann Weyl and B. L. van der Waerden in their obituaries of her.
iN The sEcond EPOch (1920–1926), nOetheR devoted hErsElf to developIng The theory oF mAtHematIcaL riNgS. in the thiRd EpocH (1927–1935), nOeTheR FOcused on noNcOMmutaTIVe algebrA, liNeAr transFoRmatIons, and CoMmutative NUmBeR fieLds. althouGH thE Results of nOetHeR's first ePOCh Were ImpressIve and useFUL, Her fame amonG matHeMaTIcianS reStS mOre on the gROUndbreAKIng woRk she diD In her SEConD and Third epOchS, as nOTED by herMaNn weyl And B. l. van deR waERden in theiR obituaries of her.