Grothendieck's work subsumed the more specialised contribution of Serre, Chevalley, Goro Shimura, and others such as Erich Kähler and Masayoshi Nagata.
Masayoshi Nagata proved in the 1950s that for any commutative local ring A with maximal ideal m there always exists a smallest ring Ah containing A such that Ah is Henselian with respect to mAh.
Yuji Nagata | Masayoshi Ōhira | Masayoshi Nagata | Linda Nagata | Ryūhō Masayoshi | Masayoshi Yamazaki | Masayoshi Son | Masaichi Nagata | Kii-Nagata Station | Hizen-Nagata Station | Hidejirō Nagata |