Halfhearted
发表于 2025-3-25 05:24:22
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Notorious
发表于 2025-3-25 10:17:38
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BARB
发表于 2025-3-25 14:13:18
Einzelkosten- und DeckungsbeitragsrechnungWhat did Projective Geometry mean before von Staudt? It owed much to Monge, but its true founder was J.V. Poncelet. He invented the so-called continuity principle (Traité des propriétés projectives des figures, 1822, p. XIII:)
孤独无助
发表于 2025-3-25 18:25:19
Cross Ratios and a Unifying Treatment of Von Staudt’s Notion of Reeller ZugOn the basis of a complex projective geometry K.G.Chr. von Staudt defined the notion of reeller Zug or what was called later on von Staudt’sche Kette. Those chains can be represented for instance in the completed complex plane as circles or lines extended by the point at infinity.
极大的痛苦
发表于 2025-3-25 21:20:51
Projectivities in Free-Like GeometriesIn a projective plane all the projectivities of a line onto itself form a group II with respect to the composition of mappings. This group is an invariant for the plane since different lines have groups which are isomorphic (also as permutation groups).
吹牛者
发表于 2025-3-26 03:52:27
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倔强不能
发表于 2025-3-26 07:16:53
Projectivities and the Topology of LinesA topological projective plane is a projective plane . = (P, .) such that P and . are topological spaces (neither discrete nor indiscrete) and join and intersection are continuous: for any open set U the set of all pairs of distinct lines intersecting in a point of U is open in .. and dually.
conspicuous
发表于 2025-3-26 12:03:03
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neuron
发表于 2025-3-26 14:56:41
The Impact of Von Staudt’s Foundations of GeometryWhat did Projective Geometry mean before von Staudt? It owed much to Monge, but its true founder was J.V. Poncelet. He invented the so-called continuity principle (Traité des propriétés projectives des figures, 1822, p. XIII:)
奇思怪想
发表于 2025-3-26 18:22:17
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