# Hyperbolicity

From Encyclopedia of Mathematics

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*Hyperbolicity* (resp., the adjective *hyperbolic*) is an extremely overloaded notion used in different contexts. Here follows a partial list of possible disambiguations.

- Hyperbolic partial differential equations
- Hyperbolic dynamical systems
- Hyperbolic functions $\sinh,\cosh,\tanh$
- Hyperbolic surfaces (in differential geometry)

**How to Cite This Entry:**

Hyperbolicity.

*Encyclopedia of Mathematics.*URL: http://encyclopediaofmath.org/index.php?title=Hyperbolicity&oldid=26035