短語詞組短語Sturm comparison theorem Sturm 比較定理comparison theorem for convergence 收歛的比較定理vector comparison theorem 曏量比較原理second comparison theorem 第二比較定理strong comparison theorem 強(qiáng)比較定理existence -comparison theorem 存在比較定理laplacian comparison theorem 拉普拉斯比較定理a comparison theorem 比較定理 返回 comparison theorem