### The Cayley-Spottiswoode coordinates of a conic in 3-space

H. S. Ruse (1935)

Compositio Mathematica

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H. S. Ruse (1935)

Compositio Mathematica

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Piotr Kalemba (2015)

Open Mathematics

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The ideal (v0) is known in the literature and is naturally linked to the structure [ω]ω. We consider some natural counterpart of the ideal (v0) related in an analogous way to the structure Dense(ℚ) and investigate its combinatorial properties. By the use of the notion of ideal type we prove that under CH this ideal is isomorphic to (v0).

Barwick, S.G. (1996)

Bulletin of the Belgian Mathematical Society - Simon Stevin

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C. Ernesto, S. Lindgren (1974)

Gaceta Matemática

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Odenhal, Boris (2006)

Mathematica Pannonica

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Boyd, John P. (1999)

Experimental Mathematics

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Scheja, Günter, Storch, Uwe (1996)

Beiträge zur Algebra und Geometrie

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Andrzej Matraś (2006)

Bulletin of the Polish Academy of Sciences. Mathematics

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J. Andre constructed a skewaffine structure as a group space of a normally transitive group. In this paper his construction is used to describe the structure of the set of circles not passing through a point of a Laguerre plane. Sufficient conditions to ensure that this structure is a skewaffine plane are given.

Janić, Milan (2003)

Novi Sad Journal of Mathematics

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Rastislav Jurga (1997)

Mathematica Slovaca

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