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Preprints of the Keldysh Institute of Applied Mathematics, 2003, 094, 18 pp. (Mi ipmp967)  
On a necessary and sufficient cyclicity condition for a quadrilateral

S. Yu. Sadov
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Abstract: A convex quadrilateral with sides $a$, $b$, $c$, $d$ and diagonals $p$, $q$ is cyclic iff $abp-bcq+cdp-daq=0$. This condition, in spite of its simplicity, appears to be unnoted and unexpectedly proof-resilient. We employ advanced methods of computer algebra and nonlinear analysis.
Document Type: Preprint
Language: Russian
Citation: S. Yu. Sadov, “On a necessary and sufficient cyclicity condition for a quadrilateral”, Keldysh Institute preprints, 2003, 094, 18 pp.
Citation in format AMSBIB
\Bibitem{Sad03}
\by S.~Yu.~Sadov
\paper On a necessary and sufficient cyclicity condition for a quadrilateral
\jour Keldysh Institute preprints
\yr 2003
\papernumber 094
\totalpages 18
\mathnet{http://mi.mathnet.ru/ipmp967}
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    		Препринты Института прикладной математики им. М. В. Келдыша РАН
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