对组合设计中正交拉丁方的历史予以阐述，分析了拉丁方问题的研究中欧拉猜想和麦克奈希猜想的作用；
Formulate the history of OLS ( orthogonal Latin squares ) and show the role that Euler 's conjecture and MacNeish 's conjecture on OLS played in the progress of study on Latin square .
欧拉猜想