In this postSolving Poisson Equation Proof in Lawrence C. Evans Theorem 1 page 23, someone has asked about the inequalities 12 and 14, which also confused me. I can understand the approximation of derivatives of $f$ (using norm), but I can't understand how to yield approximation of $$ \int_{B\left( 0,\varepsilon \right)}^{}{|\Phi \left( y \right) |\mathrm{d}y}. $$ Any help would be appreciated! Thanks!
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See https://math.stackexchange.com/questions/2180851/evans-book-pde-estimate-question – Flashhh Jul 07 '21 at 06:20
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@Flashhh Thanks:) – atlantic0cean Jul 07 '21 at 06:24