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<p>We are concerned with the invariants of Steiner chains consisting of four circles. In particular, we compute the invariant moments of curvatures in Steiner 4-chains and give two applications of the obtained formulas. Specifically, we present an algorithmic feasibility criterion for Steiner 4-chains and identify the poristic Steiner chains having extremal areas, which yields a generalization of the main results of a recent paper by K. Kiradjiev. The proofs are based on the invariants of Steiner chains described by R. Schwarz and S. Tabachnikov and on the relations between the radii of neighbouring poristic circles established by P. Yiu.</p>

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Invariants and areas of Steiner 4-chains

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • G. Bibileishvili,
  • A. Diakvnishvili

摘要

We are concerned with the invariants of Steiner chains consisting of four circles. In particular, we compute the invariant moments of curvatures in Steiner 4-chains and give two applications of the obtained formulas. Specifically, we present an algorithmic feasibility criterion for Steiner 4-chains and identify the poristic Steiner chains having extremal areas, which yields a generalization of the main results of a recent paper by K. Kiradjiev. The proofs are based on the invariants of Steiner chains described by R. Schwarz and S. Tabachnikov and on the relations between the radii of neighbouring poristic circles established by P. Yiu.