45 citations · 198 across the 112 of their papers we have counts for
32 papers · 1 filter
Weak polynomial density, diffuseness and proper infinitude
Alexandru Chirvasitu
The unitary group of a von Neumann algebra on an -dimensional Hilbert space is polynomially weak-dense (equivalently, dense or residual) in the normal uni…
Fixed-point permanence under actions by finite quantum groups
Alexandru Chirvasitu
Given an action by a finite quantum group on a von Neumann algebra , we prove that a number of familiar properties are equivalent for and the fixed-point…
Spans of quantum-inequality projections
Alexandru Chirvasitu
A hereditarily atomic von Neumann algebra is a product of matrix algebras, regarded as the underlying function algebra of a quantum set. Projections in $A\overline{\otime…
Non-commutative branched covers and bundle unitarizability
Alexandru Chirvasitu
We prove that (a) the sections space of a continuous unital subhomogeneous bundle over compact metrizable admits a finite-index expectation onto , answering a quest…
Continuity and equivariant dimension
Alexandru Chirvasitu, Benjamin Passer
We study the local-triviality dimensions of actions on -algebras, which are invariants developed for noncommutative Borsuk-Ulam theory. While finiteness of the local-trivialit…
Normal approximations of commuting square-summable matrix families
Alexandru Chirvasitu
For any square-summable commuting family of complex matrices there is a normal commuting family no farther from it, in squared normalized $\e…