3 papers
math.KT2026
Categories with conjugation and octagons of Witt groups
David W. Lewis, Jean-Pierre Tignol
A categorical approach is proposed for the construction of 8-periodic chain complexes of Witt groups of categories with duality. Exactness of the resulting sequences is proved unde…
math.RA2017
Hermitian Morita Theory: a Matrix Approach
David W. Lewis, Thomas Unger
This bundle contains the paper "Hermitian Morita Theory: a Matrix Approach", published in Irish Math. Soc. Bulletin 62 (2008), pp. 37-41 (reproduced with permission of the Irish Ma…
math.RA2007
Structure theorems for AP rings
Stefan A. G. De Wannemacker, David W. Lewis
In ``New Proofs of the structure theorems for Witt Rings'', Lewis shows how the standard ring-theoretic results on the Witt ring can be deduced in a quick and elementary way from t…