Eric Wofsey

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Name	Eric Wofsey
Member for	3 years
Seen	2 mins ago
Website	math.harvard.edu/~waffle
Location	Cambridge, MA
Age	23

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How can you tell if a space is homotopy equivalent to a manifold?

at.algebraic-topology smooth-manifolds

jul 29 10 at 20:58 John Klein 7,216●19●28

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answers

621

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Do the signs in Puppe sequences matter?

homotopy-theory at.algebraic-topology

dec 1 09 at 19:33 Hal Sadofsky 416●2●4

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answers

463

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When can you desuspend a homotopy cogroup?

at.algebraic-topology

nov 11 09 at 17:28 Reid Barton 14.5k●1●29●86

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answers

483

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Faithfully flat descent over Hopf algebras in terms of comodule structures

hopf-algebras ct.category-theory

nov 17 09 at 2:12 Greg Kuperberg 36.3k●2●116●179

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answer

346

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Why is the symmetric monoidal structure on invertible modules strict?

ct.category-theory ac.commutative-algebra

sep 20 10 at 18:18 Eric Wofsey 8,879●1●26●46

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answer

385

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Commutativity in K-theory and cohomology

at.algebraic-topology kt.k-theory-homology cohomology

mar 5 10 at 16:12 Steve Huntsman 8,139●1●22●56

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250

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Is a map that is locally fiberwise equivalent to a product a Hurewicz fibration?

gn.general-topology fibration

oct 27 09 at 17:51 Eric Wofsey 8,879●1●26●46

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719

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Why is the Euler characteristic of powers of a line bundle a polynomial in the power?

ag.algebraic-geometry

feb 25 10 at 15:03 Anton Geraschenko♦♦ 13.7k●3●48●108

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answer

256

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Is there an interpretation of the “anticommutative” symmetric monoidal structure on $\mathbb{Z}$-graded abelian groups in terms of $\mathbb{G}_m$ actions?

ra.rings-and-algebras hopf-algebras

mar 13 11 at 16:55 Theo Johnson-Freyd 22.3k●2●28●111

101

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Do good math jokes exist? (2)

Is every functor a composition of adjoint functors?

Can anyone give me a good example of two interestingly different ordinary cohomology theories?

Cohomology and fundamental classes

What are some reasonable-sounding statements that are independent of ZFC?

Why does non-abelian group cohomology exist?

What is a continuous path?

Does pointwise convergence imply uniform convergence on a large subset?

Maximal ideals in the ring of continuous real-valued functions on R

Are subfunctors of left exact functors also left exact?

This is not a category. What is it?

Elements of infinite order in a profinite group

Whitehead for maps

Are $G$-spectra the same as modules over a “group ring spectrum”?

Is there a conceptual reason why topological spaces have quotient structures while metric spaces don’t?

Are Thom spectra MU, MSO and K-theory spectra KU, KO modules over some truncations of the sphere spectrum?

Rational Morava E-theory of cyclic groups

Is every finite subcomplex of a contractible simplicial complex contained in a finite contractible subcomplex?

Pullbacks as manifolds versus ones as topological spaces

Which sequences can be extended to analytic functions? (e. g., Ackermann’s function)

Why the rank of a locally free sheaves is well defined?

What do models where the CH is false look like?

Why does the naive choice of homogeneous coordinate ring of a product of projective schemes not work?

Left/right exact functor “in nature” which is not a right/left adjoint

Is every functor inducing a homotopy equivalence a composition of adjoint functors?

(Homotopy theory) When does the 2 of 3 property not imply 2 of 6?

What is (co)homology, and how does a beginner gain intuition about it?

Construction of maps S^3 -> S^2 with arbitrary Hopf invariant?

The natural inclusion of an infinite abelian group $G$ into $\widehat{\widehat{G}}$

“Skew Cohomology” of a Space

978

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Eric Wofsey

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Questions

How can you tell if a space is homotopy equivalent to a manifold?

Do the signs in Puppe sequences matter?

When can you desuspend a homotopy cogroup?

Faithfully flat descent over Hopf algebras in terms of comodule structures

Why is the symmetric monoidal structure on invertible modules strict?

Commutativity in K-theory and cohomology

Is a map that is locally fiberwise equivalent to a product a Hurewicz fibration?

Why is the Euler characteristic of powers of a line bundle a polynomial in the power?

Is there an interpretation of the “anticommutative” symmetric monoidal structure on $\mathbb{Z}$-graded abelian groups in terms of $\mathbb{G}_m$ actions?

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