A geometric property of quadrilaterals

arXiv2303.17337MaRDI QIDQ6509430

Efstathios Konstantinos Chrontsios Garitsis, Aimo Hinkkanen

Abstract: Quadrilaterals in the complex plane play a significant part in the theory of planar quasiconformal mappings. Motivated by the geometric definition of quasiconformality, we prove that every quadrilateral with modulus in an interval $[1/K,K]$, where $K>1$, contains a disk lying in its interior, of radius depending only on the internal distances between the pairs of opposite sides of the quadrilateral and on $K$.

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