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arXiv · 2608.13593

Feasibility problem for the radii of Steiner 4-chains

Ana Diakvnishvili
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Abstract

Motivated by the solution of Descartes famous problem on the chains of tangent circles given by D.Mathews and O.Zymaris, we give an algorithmic solution to the feasibility problem for radii of Steiner 4-chains studied by K.Kirajiev. More precisely, we obtain a complete characterization of the ordered quadruples of positive numbers which coincide with a quadruple of curvatures of the circles forming a Steiner 4-chain. Our approach makes essential use of the numerical invariants of Steiner chains introduced in a recent paper of R.Schwartz and S.Tabachnikov. We compute all invariants of Steiner 4-chains and establish the algebraic relations between those invariants which are used in the proof of the main result. Several related observations and illustrative examples are also given. Keywords: Steiner chain, parent circles, Steiner porism, poristic Steiner chains, Descartes circle theorem, invariant moments of curvatures, algebraic relations between invariants, symmetric Steiner chains, feasibility problem for Steiner chains

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Ana Diakvnishvili. 2026-07-28. Feasibility problem for the radii of Steiner 4-chains. https://arxiv.org/abs/2608.13593

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