© 2016. Dr. Mamta Amol Wagh. This is a research/review paper, distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License http://creativecommons.org/licenses/by-nc/3.0/), permitting all non commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Global Journal of Science Frontier Research: F Mathematics and Decision Sciences Volume 16 Issue 4 Version 1.0 Year 2016 Type : Double Blind Peer Reviewed International Research Journal Publisher: Global Journals Inc. (USA) Online ISSN: 2249-4626 & Print ISSN: 0975-5896 A Survey on Developments in Sequence Spaces and introduction to Bicomplex Duals By Dr. Mamta Amol Wagh University of Delhi Abstract A survey on recent developments in the duality theory of sequence spaces has been done and duality in some Bicomplex sequence spaces is introduced which gives rise to sixteen types of different duals. Keywords: köthe – toeplitz dual, generalized köthe – toeplitz dual, bicomplex köthe – toeplitz dual, difference sequence spaces, generalized difference sequence spaces. GJSFR-F Classification : MSC 2010: 47B35 ASurveyonDevelopmentsinSequenceSpacesandintroductiontoBicomplexDuals Strictly as per the compliance and regulations of : -