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Answers for “在将导数结果等同于向量之后,为什么基点 p 仍然很重要?”

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Understand why

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The basepoint pp remains important because it determines the linear map Df(p)Df(p) used in the output pair. The derivative depends on the point at which it is evaluated.

Conditions: Applies to the basepoint derivative dfp(v)=(q,Df(p)v)df_p(v) = (q, Df(p)v).

Meet the concept

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The basepoint derivative dfpdf_p is a map from the tangent space at pp to the tangent space at q=f(p)q=f(p). It sends a tangent vector vv to the pair (q,Df(p)v)(q, Df(p)v), packaging the ordinary derivative with the target basepoint.

Conditions: UU is an open subset of Rn\mathbb{R}^n.; f:U→Rmf : U \to \mathbb{R}^m and f∈C1f \in C^1.; q=f(p)q = f(p).

Understand why

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The point pp serves as a basepoint. Retaining it motivates a basepoint-compatible notion of derivative, which is discussed next in the video.

Conditions: Applies to the first coordinate pp in (p,v)∈TpRn(p,v)\in T_p\mathbb{R}^n