Undergraduate Algebra

环 (代数)

環（英文：Ring）是一種帶有兩個二元運算（抽象化的「加法」和「乘法」）、並且符合特定運算規則的集合. 它抽象化了諸如整數、有理數、實數、複數、多項式、矩陣、函數、算子等等的代數結構.

Emmy Noether

Amalie Emmy Noether (, ; ; 23 March 1882 – 14 April 1935) was a German mathematician who made many important contributions to abstract algebra.

Ring (mathematics)

In mathematics, rings are algebraic structures that generalize fields: multiplication need not be commutative and multiplicative inverses need not exist.

Grup (matemàtiques)

Un grup és una estructura algebraica formada per un conjunt G d'elements on hi ha definida una operació binària, com pot ser la suma o el producte, i que compleix unes…