弦理论，它作为一条通向量子引力的道路，对上述的这个问题，只是提供了一个含糊不清的答案，不能使人满意：空间，既然可以从零维到10维。
String theory, one route to quantum gravity, gives an unsatisfactorily vague answer: space can have anything from zero to 10 dimensions.
研究了线性无关的向量组在同一级幂零指数上的线性关系，得到幂零指数在线性空间的基向量上的分布规律。
In this paper, the author researches the linear relation defined by a same nilpotent index in the independent vectors, obtains the distribution rule of the nilpotent indices on an arbitrary basis.
通过在个体类内保局差异散度矩阵的零空间中求最优特征向量，避免了矩阵的奇异性问题，解决了小样本问题。
The optimal feature vectors are extracted from the null space of intrapersonal locality preserving difference scatter matrix, which avoids the singularity and the SSS problem is solved.
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