How to learn differential and algebraic geometry?
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Differential Topology is the study of smooth manifolds and smooth maps. It is fundamentally using tools from calculus (hence the "differential" part in the name) but the focus is on spaces and maps up to diffeomorphism, which means that you don't care at all about notions like angles, lengths, curvature, flatness etc. Just like in ordinary (non-differential) topology, a gently curved line, a straight line, and a totally squiggly line are all the same up to diffeomorphism (the squiggly line should have no sharp cusps and corners though, which is how this is different from ordinary topology).
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differential topology and algebraic geometry
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