Recent changes  
 
 February 4, 2022  : 
The book ''Characters of Groups and Lattices over Orders; From Ordinary to Integral Representation Theory'' 
appeared in print as a deGruyter textbook.
 December 30, 2022  : 
The manuscript '' Differential graded orders, their class groups and idèles'' is posted 
 January 9, 2023  :  Following a suggestion by Bernhard Keller a significant simplification and generalisation
in Section 3 of ''Differential graded orders, their class groups and idèles'' is incorporated. 
Report received in August 2024, revision sent in September 2024.
 March 31, 2023  :
The new note ''Differential Graded Brauer Groups'' is posted.
accepted July 2023 in the diamond open access journal 'Revista de la Union Matematica Argentina'.
 November 28, 2023  :
The new note ''Ore Localisation for differential graded rings; Towards Goldie's theorem 
for differential graded algebras'' is posted. 
accepted on August 2024 for Journal of Algebra 
 July 3, 2024  :
The new note ''Differential graded fields and their differential graded Brauer groups'' is posted. 
Significant changes in November 2024; accepted for publication in January 2025 in the diamond open access 
journal 'Mathematica (Cluj-Romanian academy of Sciences) 
 December 2, 2024  :
The new note ''Dg-separable dg-extensions'' is posted. 
 February 21, 2025  :
The new note ''DG-Semiprimary DG-Algebras, Acyclicity and 
Hopkins-Levitzki Theorem for DG-Algebras'' is posted.