Let
PΩ(
z)
|dz| be the Poincaré metric element with the constant Gauss curvature −4 of a hyperbolic domain Ω in the complex plane
C. We find some boundary properties of the Poincaré density
PΩ and its complex partial derivatives (
PΩ)
z, (
PΩ)
zz and (
PΩ)
z\bar{z}, in terms of the distance δ
Ω(
z) of
z∈Ω and the boundary of Ω in
C. For the proof we make use of the sharp, lower estimates of
PΩ(K) of a domain Ω(
K)⊂
C such that
K=
C{\backslash}Ω(
K) is a non-degenerate continuum. Several properties of the function
p(
z,
K),
z∈Ω(
K), are proposed.
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