pullbacks
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“Problem” 45. Notes on the pullback and pushforward.
Currently, there are several problems I am working on; I seem to be stuck on all…
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Problem 41: Hartshorne II.6.8
Hartshorne Exercise II.6.8. Let $\varphi: \PP{k}{n}\ra\PP{k}{m}$ be a morphism. Then: (a) Let $f:X\ra Y$ be a…