What is the meaning of the concircular?
It says that the any five points are pairwise nonparallel and no four of them are concircular.
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I found this reference to the term concircular: "A transformation of an n-dimensional Riemannian manifold M, which transforms every geodesic circle of M into a geodesic circle, is called a concircular transformation". This term seems to be attributed to Kentaro Yano – Mufasa Sep 12 '13 at 22:08
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The usual term in geometry is concyclic, (much less frequently, cocyclic), meaning that the points lie on the same circle. That is what is intended here by the term concircular.
André Nicolas
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