The Rising Sea: Foundations of Algebraic Geometry by Ravi Vakil (2017 draft)
= The Rising Sea: Foundations of Algebraic Geometry by Ravi Vakil (2017 draft)
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By <Ravi Vakil>. The title page identifies the November 18, 2017 draft. Author-hosted PDF: https://math.stanford.edu/~vakil/216blog/FOAGnov1817public.pdf
Consulted passages: §0.4 (goals and polynomial equations), Chapter 3 (affine schemes), and the sections on rational maps and birational morphisms.