TY - BOOK AU - Ivanov,Stefan AU - Minchev,Ivan AU - Vassilev,Dimiter TI - Quaternionic contact Einstein structures and the quaternionic contact yamabe problems T2 - Memoirs of the American Mathematical Society SN - 9780821898437 (pbk. : acidfree paper) U1 - 510 23 PY - 2014/// CY - Providence PB - American Mathematical Society KW - Differential Geometry KW - Contact manifolds KW - Group theory N1 - "Volume 231, number 1086 (third of 5 numbers), September 2014."; Includes bibliographical references (pages 77-79) and index; 1. Introduction-- 2. Quaternionic contact structures and the Biquard connection -- 3. The torsion and curvature of the Biquard connection -- 4. QC-Einstein quaternionic contact structures -- 5. Conformal transformations of a qc-structure -- 6. Special functions and pseudo-Einstein quaternionic contact structures -- 7. Infinitesimal Automorphisms -- 8. Quaternionic contact Yamabe problem-- Bibliography-- Index N2 - A partial solution of the quaternionic contact Yamabe problem on the quaternionic sphere is given. It is shown that the torsion of the Biquard connection vanishes exactly when the trace-free part of the horizontal Ricci tensor of the Biquard connection is zero and this occurs precisely on 3-Sasakian manifolds ER -