ScalingStacks

Definition 6.8 . [02HW]

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Definition 6.8.

For each δ∈ℝ\delta\in\mathbb{R}, k∈ℤ≥0k\in\mathbb{Z}_{\geq 0} and α∈(0,1)\alpha\in(0,1) define the weighted Hölder norm Cδk,αC^{k,\alpha}_{\delta} by

‖a‖Cδk,α=∑j=1k‖ρϵ−δ+j​∇ja‖C0+supd⁡(x,y)<inj​gϵ​min⁡{ρϵ​(x)−δ+k+α,ρϵ​(y)−δ+k+α}​|∇ka​(x)−∇ka​(y)||x−y|α.\|a\|_{C^{k,\alpha}_{\delta}}=\sum_{j=1}^{k}{\|\rho_{\epsilon}^{-\delta+j}\nabla^{j}a\|_{C^{0}}}+\text{sup}_{d(x,y)<\text{inj}\,g_{\epsilon}}{\min{\left\{\rho_{\epsilon}(x)^{-\delta+k+\alpha},\rho_{\epsilon}(y)^{-\delta+k+\alpha}\right\}}\frac{|\nabla^{k}a(x)-\nabla^{k}a(y)|}{|x-y|^{\alpha}}}.

Here all norms and covariant derivatives are computed with respect to the metric gϵg_{\epsilon} and ∇ka​(x)\nabla^{k}a(x) and ∇ka​(y)\nabla^{k}a(y) are compared using parallel transport along the unique geodesic connecting xx and yy. Similarly set ‖a‖Cδ0=‖ρ−δ​a‖C0\|a\|_{C^{0}_{\delta}}=\|\rho^{-\delta}a\|_{C^{0}}.

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