- characteristic: adj. 有特性的；表示…特性的，… ...
- algebra: n. 代数学。
- algebra algebra: 代数(学)
In mathematics, the characteristic of a ring R, often denoted char(R), is defined to be the smallest number of times one must use the ring's multiplicative identity element (1) in a sum to get the additive identity element (0); the ring is said to have characteristic zero if this repeated sum never reaches the additive identity.