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  "body": "\n## Summary\n\nIn mathematics, a **Kleinian model** is a model of a three-dimensional hyperbolic manifold *N* by the [[quotient space|0NQ1H2X495]] $\\mathbb{H}^3 / \\Gamma$ where $\\Gamma$ is a discrete subgroup of PSL(2,**C**). Here, the subgroup $\\Gamma$, a Kleinian group, is defined so that it is isomorphic to the fundamental group $\\pi_1(N)$ of the surface *N*. Many authors use the terms *Kleinian group* and *Kleinian model* interchangeably, letting one stand for the other. The concept is named after Felix Klein.\n",
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