非秘密
发表于 2025-3-28 15:52:43
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傲慢物
发表于 2025-3-28 21:08:20
0172-5939 ture in affine geometry. The subject has a long history, and an extensive literature, but whatever novelty there may be in the study presented here comes from its focus on geometries hav ing lines that are self-orthogonal, or even singular (orthogonal to all lines). The most significant examples co