Adding this here as it may be of related interest for those who enjoyed the massive math cheat sheet on the front page recently. Evan Chen, a math student at MIT, wrote up what would be considered field notes for higher mathematics. The full PDF is here[1], complete with a dependency graph showing what you need to know before reading any particular section.

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1. https://usamo.files.wordpress.com/2019/02/napkin-v15-2019022...