User Ulrich Pennig

67 votes

Which mathematicians have influenced you the most?

answered Apr 5, 2010 at 8:48

40 votes

Solving algebraic problems with topology

answered Jun 1, 2015 at 9:11

16 votes

Topological obstruction for the existence of spin$^c$ structure

answered Jan 13, 2017 at 16:54

14 votes

Why torsion is important in (co)homology ?

answered Apr 27, 2010 at 7:14

11 votes

What can you do with a compact moduli space?

answered Apr 20, 2010 at 7:53

10 votes

A variant of the Stone-Weierstrass theorem?

answered Mar 20, 2012 at 9:39

10 votes

Accepted

Can you have a spherical plane?

answered Apr 15, 2010 at 16:41

10 votes

Multiplier algebra of $A \otimes \mathcal{K}$

answered Jun 3, 2016 at 9:29

9 votes

Accepted

simple and non nuclear $C^*$-algebra

answered Oct 20, 2015 at 15:33

9 votes

Theorems that led to very successful research programs in Geometry and Topology

answered Jan 5, 2017 at 12:11

9 votes

Accepted

K-Theory of $C^{*}(X)$

answered Aug 29, 2020 at 16:14

9 votes

Math research in the app store

answered Jun 29, 2013 at 9:53

8 votes

Bounded and weakly bounded sets in top. vector spaces

answered Apr 29, 2010 at 12:12

8 votes

Accepted

exponential functors on finite dimensional complex vector spaces

answered Apr 20, 2018 at 9:30

7 votes

Accepted

Operator Theoretical Models for $K(\mathbb{Z}, 3)$

answered May 8, 2012 at 16:29

7 votes

Inner and extendible automorphisms of C*-algebras

answered Jan 6, 2015 at 15:51

6 votes

Do we have a "topological assembly map" in the Baum-Connes conjecture?

answered Jun 18, 2013 at 12:40

6 votes

Accepted

Morita equivalence for operator algebras and tensor products, question about proof

answered Feb 21, 2014 at 10:52

6 votes

Literature on "real" $C^*$-algebras

answered Apr 10, 2014 at 12:46

6 votes

Finite projection in Von Neumann algebra

answered Sep 28, 2012 at 17:16

6 votes

How to classify von Neumann algebra bundles?

answered Feb 28, 2013 at 7:36

6 votes

Accepted

Murray-von Neumann classification of local algebras in Haag-Kastler QFT

answered Apr 16, 2010 at 10:52

6 votes

Accepted

K-group properties of quasi-diagonal $C^*$-algebras

answered Jun 7, 2017 at 14:31

6 votes

Index of a family of operators

answered Jan 4, 2016 at 13:29

5 votes

What does Freed-Hopkins-Teleman say about finite groups?

answered Jul 7, 2014 at 7:36

5 votes

Morphisms between $K_0$

answered Mar 1, 2013 at 9:38

5 votes

Accepted

Local cross sections for Unitary group in a hilbert space

answered Feb 25, 2013 at 16:42

4 votes

Is the space of -homomorphisms between two $C^$-algebras locally path connected

answered Apr 17, 2014 at 8:02

4 votes

Duality between K-theory and K-homology in the non-spin^c case.

answered Jun 16, 2013 at 18:04

4 votes

Generalized Thom spectra

answered Jan 20, 2015 at 19:52

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53 Answers

Which mathematicians have influenced you the most?

Solving algebraic problems with topology

Topological obstruction for the existence of spin$^c$ structure

Why torsion is important in (co)homology ?

What can you do with a compact moduli space?

A variant of the Stone-Weierstrass theorem?

Can you have a spherical plane?

Multiplier algebra of $A \otimes \mathcal{K}$

simple and non nuclear $C^*$-algebra

Theorems that led to very successful research programs in Geometry and Topology

K-Theory of $C^{*}(X)$

Math research in the app store

Bounded and weakly bounded sets in top. vector spaces

exponential functors on finite dimensional complex vector spaces

Operator Theoretical Models for $K(\mathbb{Z}, 3)$

Inner and extendible automorphisms of C*-algebras

Do we have a "topological assembly map" in the Baum-Connes conjecture?

Morita equivalence for operator algebras and tensor products, question about proof

Literature on "real" $C^*$-algebras

Finite projection in Von Neumann algebra

How to classify von Neumann algebra bundles?

Murray-von Neumann classification of local algebras in Haag-Kastler QFT

K-group properties of quasi-diagonal $C^*$-algebras

Index of a family of operators

What does Freed-Hopkins-Teleman say about finite groups?

Morphisms between $K_0$

Local cross sections for Unitary group in a hilbert space

Is the space of -homomorphisms between two $C^$-algebras locally path connected

Duality between K-theory and K-homology in the non-spin^c case.

Generalized Thom spectra