algebras

His classmates were labouring with elementary algebra.

他同学们正在绞尽脑汁地演算初等数题。

Four years after he graduated from school, Tom decided to dust off his algebra book.

汤姆从学校毕业四年后, 决意重温数。

In algebra, the sign X usually denotes an unknown quantity.

在数里, 符号X常来表示未知数。

He was not good at algebra in middle school.

他中学时不数。

In this paper, we proved that the definition of a semilattice as a universal algebra and the definition of a semilattice as a partial ordered set are equivalent.

本文中，我们证明了作为泛数半格定义与作为偏序集半格定义是等价。

Using the notion of coefficient matrix and maximal element.We prove that the Lie algebra is semi-simple and it has no abelian two dimensional subalgebra.

系数矩阵和极大项，证明了这类李数是半单李数且没有二维交换子数。

Further more,we prove that the cohomotopy groups is isomorphic to K1 -group of the continuous algebra on topological boundary of bounded domains in C.

在复平面C中，任意有界域拓扑边界上连续函数数K_1-群与其边界上上同伦群同构。

If you want to be a draftsman, a machinist, a molder, or a patternmaker, you'll need algebra and geometry and even trigonometry.

如果你想成为手工艺人、缝纫工、造型工或制模工，你需要数和几何，甚至三角学。