Predavanje akademika Stefana Ivanova, 21. septembar 2021.

U sredu 21. septembra 2022,  akademik Stefan Ivanov (Stefan Ivanov), profesor Fakulteta za matematiku i informatiku Univerziteta "Sv. Kliment Ohridski" iz Sofije i Instituta za matematiku i informatiku Bugarske akademije nauka (University of Sofia "St. Kl. Ohridski", Faculty of Mathematics and Informatics, Bulgaria; Institute of Mathematics and Informatics, Bulgarian Academy of Sciences) posetiće Univerzitet u Nišu i Prirodno-matematički fakultet u Nišu. Tom prilikom će  u sali br. 100 sa početkom u 13 časova održati predavanje pod nazivom

"The CR Almost Schur Lemma and the positivity conditions".

Apstrakt predavanja:
We establish a new version of the CR almost Schur Lemma which gives an estimation of the pseudohermitian scalar curvature on a compact strictly pseudoconvex pseudohermitian manifold to be a constant in terms of the norm of the traceless Webster Ricci tensor and the pseudohermitian torsion under a certain positivity condition. In the torsion-free case, i.e. for a compact Sasakian manifold, our positivity condition coincides with the known one and we obtain a better estimate.

Predavanje je moguće pratiti i na daljinu, preko Zoom platforme.

Detalji pristupa:
https://zoom.us/j/95698128247?pwd=c21HSXhJSFN4Y2taTldTWWZHbDlkUT09
Meeting ID: 956 9812 8247
Passcode: 279718



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