And we're back doing the math my eighth grade algebra teacher always swore we would use.
我们又回来做数学了,我八年级代数老师总是发誓我们会用它。
英语百科
Graded ring
In mathematics, in particular abstract algebra, a graded ring is a ring that is a direct sum of abelian groups such that . The index set is usually the set of nonnegative integers or the set of integers, but can be any monoid. The direct sum decomposition is usually referred to as gradation or grading.