代数型是数学中重要的基本概念，代数不变量是代数学的重要研究对象之一，也是数学与其它领域研究与应用的一个重要工具。
The conventional studies of algebraic invariants and geometrical properties are that these invariants are derived for planar objects using points, lines from one single image.
用双代数形式表示的不变量具有简洁、具体的表达式，可以由图像点坐标和基础矩阵直接求出。
The invariants of double algebra's form has simple and explicit expression which can be computed directly by coordinates of image points and fundamental matrix.
本交给出了惯量张量用其三个主要不变量表示的特征方程，为求特征值提供了一种代数方程解法；
This paper presents the eigen equation of inertial tensor expressed by the three principal invariants, which is an algebra-equation solution to calculate eigen value;
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