Diffeo·morphisms which satisfy the Beltrami equation with a finite Beltrami coefficient have the “quasi” form of this property. A lesser-known theorem of Liouville states that, in R-n with n greater than two, any function with this property is a composition of Mobius transformations. A function with this property that connects the upper half-plane to any simple polygon can be constructed with the Schwarz-Christoffel integral. Two subsets of the complex plane have this type of (*) equivalence if there is a bi·holo·morphic function connecting them; such equivalence exists between any simply connected open set and the unit disc per the Riemann mapping theorem. For functions with this property, the Jacobian everywhere equals a scalar multiple of a rotation matrix. For 10 points, name this type of function that locally preserves angles. ■END■
ANSWER: conformal map [accept quasi-conformal or conformally equivalent; accept biholomorphic before “biholomorphic”; reject “holomorphic”]
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