Reference number : GC-2017-Q1-01591, amendment number : , agreement type : G, recipient legal name : Li, Yuanlin (Brock University), recipient country : CA, recipient province : nan, recipient city : Ontario, recipient postal code : nan, program name english : Discovery Grants Program - Individual, program name french : Programme de subventions à la découverte - individuelles, program purpose english : A ring is an algebraic system with two operations: addition and multiplication. For example, all integers with regular addition and multiplication form a ring. The group ring of a group G over a commutative ring K is the ring KG of all formal finite sums. It is an attractive and important object of study in algebra. Here group theory, ring theory, commutative algebra, representation theory and number theory come together in a fruitful way. 
 
My recent work has shed light on the algebraic structures (and the internal arithmetic ) of group rings and their unit groups, and it has important applications in coding theory and combinatorial number theory. This will continue to be one of the main streams of my research program for the next 5 years. I will study several open problems and conjectures regarding group rings, including the first Zassenhaus Conjecture - a long standing research problem- and the normalizer problem. I will also investigate the structure of star-clean and reversible group rings. 
 
Zero-sum theory is a new branch of combinatorial number theory. Recently I have begun exploring some exciting innovative connections between combinatorial number theory and my work in group rings. Dr. Weidong Gao and I are able to use group rings as the main tool to investigate several open problems in zero-sum theory concerning several important invariants such as the Davenport constant and the index of sequences. We have already made significant contributions in this research area. Further research is ongoing, and we anticipate reporting significant advances in the immediate future. I am also involved in other areas such as (combinatorial) group theory where I have obtained new results concerning groups with small squaring property, and algebraic coding theory. 
 
The outcomes of my research will not only add knowledge to the areas of group rings and zero-sum theory but also inspire other researchers in these areas and other areas to which my research may apply., program purpose french : A ring is an algebraic system with two operations: addition and multiplication. For example, all integers with regular addition and multiplication form a ring. The group ring of a group G over a commutative ring K is the ring KG of all formal finite sums. It is an attractive and important object of study in algebra. Here group theory, ring theory, commutative algebra, representation theory and number theory come together in a fruitful way. 
 
My recent work has shed light on the algebraic structures (and the internal arithmetic ) of group rings and their unit groups, and it has important applications in coding theory and combinatorial number theory. This will continue to be one of the main streams of my research program for the next 5 years. I will study several open problems and conjectures regarding group rings, including the first Zassenhaus Conjecture - a long standing research problem- and the normalizer problem. I will also investigate the structure of star-clean and reversible group rings. 
 
Zero-sum theory is a new branch of combinatorial number theory. Recently I have begun exploring some exciting innovative connections between combinatorial number theory and my work in group rings. Dr. Weidong Gao and I are able to use group rings as the main tool to investigate several open problems in zero-sum theory concerning several important invariants such as the Davenport constant and the index of sequences. We have already made significant contributions in this research area. Further research is ongoing, and we anticipate reporting significant advances in the immediate future. I am also involved in other areas such as (combinatorial) group theory where I have obtained new results concerning groups with small squaring property, and algebraic coding theory. 
 
The outcomes of my research will not only add knowledge to the areas of group rings and zero-sum theory but also inspire other researchers in these areas and other areas to which my research may apply., agreement title english : Arithmetic in group rings and study of zero-sum problems in combinatorial number theory, agreement title french : Arithmetic in group rings and study of zero-sum problems in combinatorial number theory, agreement number : RGPIN, agreement value : 70000.0, agreement start date : 2017-05-10, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year. (2017-2018 to 2022-2023), additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier. (2017-2018 à 2022-2023), owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada