What Does rank Mean?
What Does rank Mean?
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While winning a slew of targeted traffic through the SERPs may perhaps, initially, sound similar to a dream occur legitimate to any web page operator, it will ordinarily only affect standard business goals if this targeted traffic converts into revenue or other key actions. One example is, an independently owned doughnut store in San Francisco may reach 1st-page rankings in Google for sourdough doughnuts.
把上述证明过程中的“行”与“列”交换，利用对偶性质同样可证 A displaystyle A
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superior/very low/middle rank The committee generally is made up of people today of an increased rank than the individual becoming interviewed.
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阶子式全为零，即矩阵的最高阶非零子式的阶数为r。则称 r displaystyle r
线性空间 · 线性变换 · 线性子空间 · 线性生成空间 · 基 · 线性映射 · 线性投影 · 線性無關 · 线性组合 · 线性泛函 · 行空间与列空间 · 对偶空间 · 正交 · 特征向量 · 最小二乘法 · 格拉姆-施密特正交化
的列向量组的秩，也即矩阵的列空间的维数。类似地，矩阵的行秩定义为 A displaystyle A
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矩阵的行秩与列秩相等，是线性代数基本定理的重要组成部分。其基本证明思路是，矩阵可以看作线性映射的变换矩阵，列秩为像空间的维度，行秩为非零原像空间的维度，因此列秩与行秩相等，即像空间的维度与非零原像空间的维度相等（这里的非零原像空间是指约去了零空间后的商空间：原像空间）。这从矩阵的奇异值分解就可以看出来。
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