Poincaré Hyperbolic Disk
A 2-D space having Hyperbolic Geometry defined as the 2-Ball 
, with HyperbolicMetric
The Poincaré disk is a model for Hyperbolic Geometry, and there is an isomorphism between the Poincaré disk model and the Klein-Beltrami Model.See also Elliptic Plane, Hyperbolic Geometry, Hyperbolic Metric, Klein-Beltrami Model
- Euler Line
- Euler-Lucas Pseudoprime
- Euler-Maclaurin Integration Formulas
- Euler-Mascheroni Constant
- Euler-Mascheroni Integrals
- Euler Measure
- Euler Number
- Euler Parameters
- Euler-Poincaré Characteristic
- Euler Polyhedral Formula
- Euler Polynomial
- Euler Polynomial Identity
- Euler Power Conjecture
- Euler Product
- Euler Pseudoprime
- Euler Quartic Conjecture
- Euler's 6n+1 Theorem
- Euler's Addition Theorem
- Euler's Circle
- Euler's Conjecture
- Euler's Criterion
- Euler's Displacement Theorem
- Euler's Distribution Theorem
- Euler's Factorization Method
- Euler's Finite Difference Transformation