Recentemente, B.-Y. Chen ha introdotto una nuova serie di invarianti riemanniani per ogni varietà riemanniana. Ha anche ottenuto disuguaglianze strette per questi invarianti per sottovarietà di forme spaziali reali e complesse in funzione della loro curvatura media. Nel presente lavoro proviamo analoghe stime per gli invarianti per sottovarietà -totalmente reali e di contatto di una forma spaziale di Sasaki .
@article{BUMI_2001_8_4B_2_521_0, author = {Filip Defever and Ion Mihai and Leopold Verstraelen}, title = {B.-Y. Chen's inequalities for submanifolds of Sasakian space forms}, journal = {Bollettino dell'Unione Matematica Italiana}, volume = {4-A}, year = {2001}, pages = {521-529}, zbl = {1121.53320}, mrnumber = {1832002}, language = {en}, url = {http://dml.mathdoc.fr/item/BUMI_2001_8_4B_2_521_0} }
Defever, Filip; Mihai, Ion; Verstraelen, Leopold. B.-Y. Chen's inequalities for submanifolds of Sasakian space forms. Bollettino dell'Unione Matematica Italiana, Tome 4-A (2001) pp. 521-529. http://gdmltest.u-ga.fr/item/BUMI_2001_8_4B_2_521_0/
[1] 509, Springer, Berlin, 1976. | MR 467588 | Zbl 0319.53026
, Contact Manifolds in Riemannian Geometry, Lecture Notes in Math., vol.[2] Some pinching and classification theorems for minimal submanifolds, Archiv Math., 60 (1993), 568-578. | MR 1216703 | Zbl 0811.53060
,[3] A Riemannian invariant for submanifolds in space forms and its applications, Geometry and Topology of Submanifolds, 6 (1994), 58-81, World Scientific, Singapore. | MR 1315088 | Zbl 0865.53050
,[4] Some new obstructions to minimal and Lagrangian isometric immersions, submitted. | Zbl 1026.53009
,[5] Totally real submanifolds of satisfying a basic equality, Archiv. Math., 63 (1994), 553-564. | MR 1300757 | Zbl 0816.53034
- - - ,[6] F. DILLEN, L. VERSTRAELEN AND , An exotic totally real minimal immersion of in and its characterization, Proc. Roy. Soc. Edinburgh Sect. A, 126 (1996), 153-165. | MR 1378838 | Zbl 0855.53011
,[7] B.-Y. Chen's inequality for -totally real submanifolds of Sasakian space forms, Boll. Un. Mat. Ital., 11-B (1997), 365-374. | MR 1459285 | Zbl 0884.53042
- - ,[8] | MR 425849 | Zbl 0349.53055
- , Anti-invariant Submanifolds, Lecture Notes in Pure and Applied Mathematics, Marcel Dekker, New York, 1976.[9] | MR 688816 | Zbl 0496.53037
- , CR-Submanifolds of Kaehlerian and Sasakian Manifolds, Birkhäuser, Boston, 1983.[10] 3, World Scientific, Singapore, 1984. | MR 794310 | Zbl 0557.53001
- , Structures on Manifolds, Series in Pure Mathematics, vol.