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most citedCoupling of the Legendre polynomials with kernels and

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math.GM2004★ 1 cited

On a necessary and sufficient cyclicity condition for a quadrilateral

Sergey Sadov

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 pro…