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KIAM Preprint № 94, Moscow, 2003
Authors: Sadov S.Y.
On a Necessary and Sufficient Cyclicity Condition for a Quadrilateral.
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.
Publication language: russian,  pages: 18
Research direction:
Mathematical problems and theory of numerical methods
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About authors:
  • Sadov S. Y.,  KIAM RAS