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math.RA2022
From length-preserving pushouts of graphs to one-surjective pullbacks of graph algebras
Piotr M. Hajac, Mariusz Tobolski
The unions of directed graphs are the simplest examples of pushouts of directed graphs. The conditions under which they contravariantly induce surjective gauge-equivariant pullback…
math.OA2022
Noncommutative numerable principal bundles from group actions on C*-algebras
Mariusz Tobolski
We introduce a definition of the locally trivial -C*-algebra, which is a noncommutative counterpart of the total space of a locally compact Hausdorff numerable principal -bun…