Greg Friedman

Texas Christian University

http://faculty.tcu.edu/gfriedman/

I'm a topologist, specializing in stratified spaces and intersection homology. I've also done some work on high dimensional knot theory, particularly PL singular knots and disk knots.

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What group is $\langle a,b \,| \, a^2=b^2 \rangle$?

gr.group-theory at.algebraic-topology fundamental-group asked Dec 13, 2010 at 20:57

mathoverflow.net

18 votes

References for Eilenberg-Zilber shuffle product

at.algebraic-topology gt.geometric-topology homological-algebra co.combinatorics asked Oct 8, 2012 at 16:51

mathoverflow.net

17 votes

Where can I find resources for creating a mathematics “bridge course”?

undergraduate-education course-design textbooks asked May 13, 2014 at 9:26

matheducators.stackexchange.com

13 votes

What characteristic class information comes from the 2-torsion of $H^*(BSO(n);Z)$?

at.algebraic-topology gt.geometric-topology asked Feb 28, 2011 at 22:42

mathoverflow.net

12 votes

Conventions for definitions of the cap product

at.algebraic-topology gt.geometric-topology asked Aug 26, 2010 at 0:44

mathoverflow.net

10 votes

Ranicki symmetric L-groups of finite fields?

at.algebraic-topology gt.geometric-topology asked Dec 4, 2010 at 23:55

mathoverflow.net

9 votes

How does the Lefschetz-Poincare dual torsion linking pairing on manifolds with boundary interact with the maps of the long exact sequence of the manifold-boundary pair?

at.algebraic-topology gt.geometric-topology manifolds homological-algebra asked Jun 8, 2010 at 4:36

mathoverflow.net

9 votes

Signs and functoriality of tensor products

at.algebraic-topology homological-algebra ct.category-theory asked Jul 5, 2011 at 22:57

mathoverflow.net

8 votes

Homology of inverse limits over inverse systems more complicated than towers

at.algebraic-topology homological-algebra asked Jun 27, 2016 at 18:23

mathoverflow.net

8 votes

What is a principal refinement of a Postnikov system?

at.algebraic-topology asked Jul 29, 2010 at 19:29

mathoverflow.net

Top Answers

What (if anything) happened to Intersection Homology?

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References for sign conventions in homological algebra

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Short exact sequences every mathematician should know

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Two points of view about Borel-moore homology

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So what exactly are perverse sheaves anyway?

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Any shortcuts to understanding the properties of the Riemannian manifolds which are used in the books on algebraic topology

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Singular Homology/Cohomology as a derived functor?

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Geometric meaning of L-genus

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Which journals publish expository work?

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Exotic smooth structures on Lie groups?

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Stratified pseudomanifold

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Integral homology classes that can be represented by immersed submanifolds but not embedded submanifolds

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Cobordism categories that don't involve manifolds

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Singular analog of cellular homology

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Is intersection homology the usual homology of something else?

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When is a finite cw-complex a compact topological manifold?

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worked out examples in borel-moore homology

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What are examples when the equality of some invariants is good enough in algebraic topology?

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Computing Massey products via intersection theory

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references / general idea of kervaire invariant problem

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Is there a reference containing standard mathematical notations?

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Modern source for spectra (including ring spectra)

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Are there non-contractible spaces $A$ and $B$ such that $A \wedge B$ is contractible?

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"Correct" definition of stratified spaces and reference for constructible sheaves?

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A recommendation for a book on perverse sheaves

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How to deal with an advisor that offers you nearly no advising at all?

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If $H_i(U_j)=0$ for infinitely many $j$ then $H_i(X)=0$

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How should a homotopy theorist think about sheaf cohomology?

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Where to start with research regarding maslov index/class

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Integer cohomology of the Grassman manifold of n planes in $R^\infty$

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