Mathematical analysis. Consider a more specific tag instead: (real-analysis), (complex-analysis), (functional-analysis), (fourier-analysis), (measure-theory), (calculus-of-variations), etc. For data analysis, use (data-analysis).

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The closure of an open set in $\mathbb{R}^n$ is a manifold

I want to solve the following exercise from M. Spivak's Calculus on Manifolds (p. 114): (a) Let $A \subseteq \mathbb{R}^n$ be an open set such that boundary $A$ is an $(n-1)$-dimensional manifold. ...
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A Learning Roadmap to the “foundations” of Nonlinear Analysis (and certain specific topics)

I'm searching for throughout references that -- in the long term -- can help me gradually gain a solid background and firm foundations to understand the main methods and theorems to deal with ...