in göttingen, noether supervised more than a dozen doctoral students; her first was grete hermann, who defended her dissertation in february 1925. she later spoke reverently of her "dissertation-mother". noether also supervised max deuring, who distinguished himself as an undergraduate and went on to contribute significantly to the field of arithmetic geometry; hans fitting, remembered for fitting's theorem and the fitting lemma; and zeng jiongzhi (also rendered "chiungtze c. tsen" in english), who proved tsen's theorem. she also worked closely with wolfgang krull, who greatly advanced commutative algebra with his "hauptidealsatz" and his dimension theory for commutative rings.