此外，当矩阵为非退化对称双正加阵时，该序列收敛。
Moreover, when A is a nondegenerate, symmetric and copositive plus matrix, the sequence converges to a solution of the problem.
伊丽莎白·布莱克本和杰克·卓斯塔克发现，由于端粒上有独特的DNA序列，从而能防止染色体的退化。
Elizabeth Blackburn and Jack Szostak discovered that a unique DNA sequence in the telomeres protects the chromosomes from degradation.
通过该方法，可以避免随机运动序列中存在的小角度运动以及纯平移一类的退化情况对标定精度的影响，得到符合手眼标定精度的要求。
By using motion selection, the bad effect of small rotations and the degenerate motions such as pure translations will be removed and the accuracy of online hand-eye calibration be improved.
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