In order to solve the problem of complete system of orthogonal Latin squares, relation between Latin square and permutation groups is discussed by using method of algebra.
为了解决正交拉丁方完备组问题，利用代数方法讨论了拉丁方与正则群的关系。
Since then, other weaker versions such as "near orthogonal", "incomplete orthogonal", "perpendicular" Latin squares were investigated by many authors.
此后，各种比正交弱的概念被陆续提出和研究。
Since then, other weaker versions such as "near orthogonal", "incomplete orthogonal", "perpendicular" Latin squares were investigated by many authors.
此后，各种比正交弱的概念被陆续提出和研究。
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