A concept of kernel matrix of quaternion is proposed, which is based on rotation group algebra and with spacecraft attitude control as its background.

基于旋转群代数，以航天器姿态控制研究为背景，提出了四元数的核心矩阵的概念。

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The structure of the idempotent elements, regular elements and maximal subgroups and the number of the idempotent elements and regular elements in Boolean group algebra are given.

给出了布尔群代数半群中的幂等元、极大子群和正则元的结构以及幂等元和正则元的个数。

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Group Explorer is mathematical visualization software for the abstract algebra classroom. Users can explore dozens of finite groups (and morphisms among them) visually and interactively.

这是一个数学的形象化软件用于抽象代数课堂。用户可以交互直观的探究很多的有限组。

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During Operation Algebra, Lothian and Borders Police identified up to 70 contacts of the group throughout Britain and abroad.

BBC: Paedophile network members jailed

But a first group of five courses on the Coursera platform, including a genetics course from Duke University and algebra at University of California, Irvine, have been recommended for accreditation.

BBC: Online university giant gets bigger