序列二次算法求大量的约束优化问题，外文，非常好的文献-Sequential Quadratic algorithm for a large number of constrained optimization problems, foreign languages, very good literature

半二次优化算法，研究。软阈值公式推导。最早的一篇论文。非常有参考价值。-Half-quadratic optimization algorithms, research. Soft threshold formula derivation. The earliest paper. Very valuable reference.