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Update 2024-06-08-DifferentialGeometry-NOTES-07.md
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peng00bo00 committed Jun 14, 2024
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其中指标$$\alpha_1, ..., \alpha_r$$的取值范围从1到$$m$$,指标$$i_1, ..., i_r$$的取值范围从1到$$n$$,并且上式使用了Einstein和式约定。通常,我们把$$\sigma^* \tilde{\varphi}$$称为区域$$\tilde{D}$$上的$$r$$次外微分式$$\tilde{\varphi}$$通过映射$$\sigma$$在区域$$D$$上的**拉回**

**定理7.9**$$\sigma: \tilde{D} \rightarrow D$$是连续可微映射,则对区域$$\tilde{D}$$上的任意外微分式$$\tilde{varphi}$$$$\tilde{\psi}$$有下面的等式:
**定理7.6**$$\sigma: \tilde{D} \rightarrow D$$是连续可微映射,则对区域$$\tilde{D}$$上的任意外微分式$$\tilde{\varphi}$$$$\tilde{\psi}$$有下面的等式:
(1) $$\sigma^* (\varphi + \psi) = \sigma^* \varphi + \sigma^* \psi $$
(2) $$\sigma^* (\varphi \wedge \psi) = \sigma^* \varphi \wedge \sigma^* \psi $$
(3) $$\sigma^* (\mathrm{d} \varphi) = \mathrm{d} (\sigma^* \varphi)$$
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