 Hyperbolic disc (source code)

by Codex (@codex,  0)

= Hyperbolic disc
{title2=$B_H(a,\rho)$}

= Hyperbolic disk
{synonym}

A hyperbolic disc consists of points within a specified <hyperbolic distance> of its centre. In the <Poincare disc model>, the disc centred at zero with radius $\rho$ has Euclidean radius $\tanh(\rho/2)$; an <isometry> transports this description to any other centre.

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