Elliott Distinguished
Visitor Lectures
February 25 - March 27
(video
of the talks)
Speaker:
Eberhard Kirchberg, Humboldt-Universität zu Berlin
*please contact us at thematic<at>fields.utoronto.ca
if you notice any errors in the Lecture notes, thank you*
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Content of Lectures |
1
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Towards ideal-system equivariant classification
(Lecture
Notes)
Basic definitions and terminology, statement
of the main results: Embedding Theorem, Theorem on realization
of ) by C*-morphisms,
On applications.
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2
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An ideal system equivariant Embedding
Theorem (I) (Lecture
Notes)
A generalized Weyl-von-Neumann Theorem in
the spirit of Voiculescu and Kasparov, Actions of topological
spaces on C*-algebras versus matrix operator convex
cones \mathcal{C}, related "universal" Hilbert
bi-modules, Cone {\mathcal{C}}-dependent Ext-groups
\mathrm{Ext}(\mathcal{C};\, A,B), Related semi-groups.
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3
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Ideal system equivariant Embedding Theorem (II)
(Lecture
Notes)
C*-systems and its use for embedding results,
the example of embeddings into \mathcal{O}_2, criteria
for existence of ideal equivariant liftings, i.e. characterization
of invertible elements in the extension semigroup.
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4
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Ideal system equivariant Embedding Theorem
(III)
Proof of a special case by construction of
a suitable C*-system, Outline of the idea for the proof
of the general case by study of asymptotic embeddings,
using continuous versions of Rørdam semi-groups.
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5
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Some properties of strongly purely infinite
algebras
Operations on the class of s.p.i. algebras,
coronas and asymptotic algebras of strongly purely infinite
algebras, tensorial absorption of \mathcal{O}_\infty,
1-step innerness of residually nuclear c.p. maps.
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6
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Rørdam groups R(\mathcal{C};\,
A,B) (I)
Definition and properties of the natural group
epimorphism from the \mathcal{C}-dependent Rørdam
group R(\mathcal{C};\, A,B) onto Ext(\mathcal{SC};
A; SB), reduction of the isomorphism problem to the
question on homotopy invariance of R(\mathcal{C};\,
A,B), Some cases of automatic homotopy invariance:
the "absorbing" zero element.
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7
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Rørdam groups (II)
Homotopy invariance of R(\mathcal{C};\, A,B),
existence of C*-morphisms \varphi:A \rightarrow B
that represent the elements of R(\mathcal{C};\, A,B),
proof of the Embedding Theorem in full generality.
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8
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Cone-related KK-groups KK(\mathcal{C};\,
A,B)) (I)
Definition and basic properties of \mathcal{C}-related
(\mathbb{Z_2}-graded) Kasparov groups KK(\mathcal{C};\,
A,B) for graded m.o.c. cones \mathcal{C}, the isomorphisms
Ext(\mathcal{C};\, A,B) \cong KK(\mathcal{C_{(1)}};\,
A,B_{(1)}) and Ext(\mathcal{SC};\, A,SB) \cong
KK(\mathcal{C};\, A,B) in trivially graded case. Homotopy
invariance of Ext(\mathcal{SC};\, A,SB). The isomorphism
Ext(\mathcal{SC};\, A,SB) \cong R(\mathcal{C};\,
A,B).
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9
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Cone-related KK-groups KK(\mathcal{C};\,
A,B) (II)
The KK_{X}(A;B) := KK(\mathcal{C_{X}};\,
A,B) classification for X \cong Prim(A) \cong Prim(B),
where A, B are stable amenable separable C*-algebras.Structure
of the algebras with ideal-system preserving zero-homotopy.
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10
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Some conclusions of the classication results and open questions
(Lecture Notes)
Constructions of examples of algebras with
given second countable locally compact sober T_0 spaces
(not necessarily Hausdorff). Minimal requirement for
a weak version of a universal coefficent theorem for
ideal-equivariant classication, indications of possible
equivariant versions for actions of compact groups (up
to 2-cocycle equivalence).
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