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math.KT2026
A secondary pairing between K-theory and K-homology, relative eta invariants, and zeta maps
Rufus Willett
The -homology groups of a -algebra are receptacles for information from topology, operator algebra theory, and representation theory. For applications, one often wants to k…
math.GR2026
The Local Lifting Property, Property FD, and stability of approximate representations
Francesco Fournier-Facio, Rufus Willett
We establish Kirchberg's Local Lifting Property and Lubotzky--Shalom's Property FD for classes of finitely generated groups of central importance in geometric and combinatorial gro…