If you are a serious researcher in geometric analysis, PDEs, or fractal geometry, you have access to Federer’s Geometric Measure Theory . Whether that is the legal PDF from your university library, a well-scanned copy from the internet, or a dog-eared physical book from a used bookstore, the content is non-negotiable.
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Last month, I finally decided to stop treating the PDF on my hard drive as a sacred artifact and actually opened it. Here is the view from the trenches. If you are a serious researcher in geometric