TheoremBase

Pullback by a Smooth Map Commutes with the Exterior Derivative

Statement

Let n,m∈n,m\in N\mathbb{N} and k∈N∪{0}k\in\mathbb{N}\cup\{0\}. Let U⊆RnU\subseteq\mathbb{R}^n and V⊆RmV\subseteq\mathbb{R}^m be open subsets of Euclidean space, let F:U→VF:U\to V be a smooth map, and let ω\omega be a C1C^1 differential kk-form on VV. Then the pullback F∗ωF^{*}\omega is a C1C^1 differential kk-form on UU, and

d(F∗ω)=F∗(dω),d(F^{*}\omega)=F^{*}(d\omega),

where on the left dd denotes the exterior derivative on UU applied to F∗ωF^{*}\omega, and on the right dωd\omega is the exterior derivative of ω\omega on VV, whose pullback under FF is again taken in the sense of Pullback of a Differential Form by a C^1 Map.

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