Onerous
发表于 2025-3-30 10:32:06
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彻底明白
发表于 2025-3-30 15:18:20
Book 2016of varieties embedded in projective spaces, their secant and tangent lines, the behavior of tangent linear spaces, the algebro-geometric and topological obstructions to their embedding into smaller projective spaces, and the classification of extremal cases. It also provides a solution of Hartshorne