空间同构（isomorphic）
1. introduction
对于一个 M22 矩阵空间，其 dimM22=4，基的构成如下：
则：M22≅R4
对于 P3 多项式空间，也即：P3:at3+bt2+ct+d，其基也有如下的四个元素构成：
同样地，也有 P3≅R4
定理：两个有限维空间是同构的 ⇔ 它们的维度相同。
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