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P51. Let f in B be a homogeneous element. D+(f) constitute a base.
D+(f) = ProjB \ V+ (fB). The open sets of this form are called principal open sets. They constitute a base of open sets of Proj B. In fact, we can restrict ourselves to the open sets D+ (f)
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By LucD+(f) = ProjB \ V+ (fB). The open sets of this form are called principal open sets. They constitute a base of open sets of Proj B. In fact, we can restrict ourselves to the open sets D+ (f)