# Hadamard manifold

> complete, simply-connected Riemannian manifold with nonpositive sectional curvature everywhere

**Wikidata**: [Q3554817](https://www.wikidata.org/wiki/Q3554817)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hadamard_manifold)  
**Source**: https://4ort.xyz/entity/hadamard-manifold