How statement and proof provenance work
The first chip identifies the source of the statement or construction; the second identifies the source of its local proof or verification.
- Literature-sourced: the exact statement appears in a cited source; only wording and notation differ.
- AI-adapted: a semantically identical restatement of literature-sourced material, modulo indexing, notation, and boundary cases adopted by the library.
- AI-generated: a genuinely novel statement formulated by AI, with no source for the claim itself.
These labels describe origin, not correctness: citations and verification chips remain separate evidence.
A linear map in Euclidean coordinates
Definition
Let . A map is linear when
for all and all . Both spaces carry their Euclidean vector-space operations and Euclidean norms from The Euclidean inner product on .
Remarks
This is the concrete Euclidean notion required for total differentiation. It makes no assertion about linear maps between arbitrary vector spaces.
Depends on
Used by
- x²y/(x²+y²) has every directional derivative at the origin but is not totally differentiable there Counterexample
- Invertible Euclidean linear maps Definition
- The total (Fréchet) derivative Df(a) as the linear first-order approximation with o(‖h‖₂) remainder Definition
- Every Euclidean linear map has a unique matrix and satisfies ‖Lh‖₂≤ K‖h‖₂ for some K≥0 Lemma
- Dimension, openness, norm, Jacobian, and the native Euclidean linear-map agreement seam Remark
- Sums and scalar multiples of totally differentiable maps are totally differentiable with the expected derivatives Theorem
- The chain rule for total derivatives: D(g∘ f)(a)=Dg(f(a))∘ Df(a) Theorem
Dependency tree · next 3 levels
Direct dependencies and their dependencies through the next three levels: 79 results over 17 levels. An arrow runs from a result to what uses it, and this result sits at the bottom with a heavier outline. Click the chart to enlarge it.
Sources
- J. Lebl, Basic Analysis I, §8.3 (standard reference, not scraped)