Sasakian manifold
In differential geometry , a Sasakian manifold ( named after Shigeo Sasaki ) is a contact manifold formula_1 equipped with a special kind of Riemannian metric formula_2 , called a "Sasakian" metric . 
<triplet> Sasakian manifold <subj> Shigeo Sasaki <obj> named after <subj> contact manifold <obj> subclass of