Basics of Almost Contact Metric Manifolds and Their Subclasses
摘要
Sasaki and Hatakemaya (1962) introduced the Sasakian structure with the help of the previous work of Sasaki in Sasaki (Tohoku Math J 12:459–476, 1960). But the first attempt was made in Blair (Contact Manifolds in Riemannian Geometry, 1976) to spread the interest for the subject. The Sasakian structure is regarded an odd-dimensional analogue of the Kähler structure, and thus, Sasakian manifolds relate to K-contact manifolds as Kähler manifolds relate to almost Kähler manifolds.