# Better butterfly theorem in the isotropic plane

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Mathematical Communications, Vol.11 No.1 July 2006. -

A real affine plane A 2 is called an isotropic plane I 2, if in A 2 a metric is induced by an absolute {f, F}, consisting of the line at infinity f of A 2 and a point $F\in f$.

Better butterfly theorem is one of the generalisations of the well-known butterfly theorem (1, 4). In this paper the better butterfly theorem has been adapted for the isotropic plane and its validity in I 2 has been proved.

isotropic plane; better butterfly theorem

Autor: J. Beban-Brkić -

Fuente: http://hrcak.srce.hr/

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