Siraj Uddin — Neckpinchhttps://neckpinch.com/authors/siraj-uddin/New arXiv papers by Siraj Uddin, from Neckpinch Tue, 10 Nov 2026 04:10:28 GMT Invariant submanifolds of generalized Sasakian-space-formshttps://neckpinch.com/papers/1707.04985/arxiv:1707.04985Mon, 17 Jul 2017 00:00:00 GMTShyamal Kumar Hui, Siraj Uddin, Ali H. Alkhaldi, Pradip Mandal — The present paper deals with the study of invariant submanifolds of generalized Sasakian-space-forms with respect to Levi-Civita connection as well as semi-symmetric metric connection. We provide some examples of such submanifolds and obtain many new results including, the necessary and sufficient conditions under which the submanifolds are totally geodesic. The Ricci solitons of such submanifolds are also studied.Ricci solitonsSphere theoremsSasakian & contact geometry