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线性变换及其与矩阵的关系——线性代数的本质（三）Unfortunately, no one can be told what the Matrix is. You have to see it...
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线性组合（linear combinations）, 生成空间（span）, 基向量（basis vectors）——线性代数本质（二）Mathematics requires a small dose, not of genius, but of an imaginative ...
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向量是什么——线性代数本质（一）介绍 There is hardly any theory which is more elementary than linear algeb...
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