TheoremBase

Pullback of a Differential Form by a C1C^1 Map

Statement

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

(F∗ω)x(v1,…,vk)=ωF(x)(JF(x)v1,…,JF(x)vk)(F^{*}\omega)_x(v_1,\dots,v_k)=\omega_{F(x)}\bigl(J_F(x)v_1,\dots,J_F(x)v_k\bigr)

for every x∈Ux\in U and every vectors v1,…,vk∈Rnv_1,\dots,v_k\in\mathbb{R}^n, where JF(x)vrJ_F(x)v_r denotes the matrix-vector product from the definition of matrix-vector multiplication, applied to the Jacobian matrix appearing in the differentiability definition.

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